Fix wxHMI example after upgrading wxGlade

Newer wxGlade generates code to initialize GridSizer's with empty
elements.

...
grid_sizer_1.Add(self.window_1, 1, wx.ALIGN_CENTER, 0)
sizer_2.Add((0, 0), 0, 0, 0)
sizer_2.Add((0, 0), 0, 0, 0)
sizer_2.Add((0, 0), 0, 0, 0)
sizer_2.Add((0, 0), 0, 0, 0)
...

That causes following traceback, if new buttons are added
to already full sizer.

PLCobject : Traceback (most recent call last):

File "./Beremiz_service.py", line 389, in default_evaluator
res = (tocall(*args, **kwargs), None)

File "/tmp/tmpQS8ct2/runtime_0.py", line 540, in _runtime_0_start
wx.MessageBox(_("Please stop PLC to close"))

File "/tmp/tmpQS8ct2/runtime_0.py", line 504, in Init
lambda axis:( MakeButtonFunc(self, sizer, axis+"axisMinus"),

File "/tmp/tmpQS8ct2/runtime_0.py", line 502, in <lambda>
lambda btname: MakeButtonFunc(self, sizer, btname), ActionButtons)

File "/tmp/tmpQS8ct2/runtime_0.py", line 461, in MakeButtonFunc
print sizer, btname

File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk3/wx/_core.py", line 14453, in Add
return _core_.Sizer_Add(*args, **kwargs)

PyAssertionError: C++ assertion "Assert failure" failed at
../src/common/sizer.cpp(1401) in DoInsert(): too many items (11 > 2*5)
in grid sizer (maybe you should omit the number of either rows or
columns?)


Tested with wxGlade version 0.8.3
Closes #41

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How Do I Submit A Good Pull Request?

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----------------------------------

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It's highly recommended to write nice and clean python code. Beremiz

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project tries to follows most of PEP-8 recommendations. They are

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automatically checked on every push and merge by Bitbucket pipelines.

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To avoid pushing "unclean" code, i's recommended to add one of the following

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commands to pre commit Mercurial hook into .hg/hgrc configuration file.

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Unfortunately script can't distinguish between real commit and shelve. If you

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are using shelve (or maybe some other affected commands), it's recommended to

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use pre-<command> and post-<command> hooks to create flags to skip checks on

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some operations.

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```

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[hooks]

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pre-shelve.linter = touch .hg/skiphook

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post-shelve.linter = rm .hg/skiphook

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pretxncommit.linter = ./tests/tools/check_source.sh --only-changes

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```

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or the same done using Docker container, so result will be the same as

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on Bitbucket pipeline.

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```

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[hooks]

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pre-shelve.linter = touch .hg/skiphook

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post-shelve.linter = rm .hg/skiphook

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pretxncommit.linter = hg status -m -n -a -n -I '**.py' --change $HG_NODE > files.lst && docker run --volume=$PWD:/beremiz --workdir="/beremiz" --volume=$PWD/../CanFestival-3:/CanFestival-3 --memory=1g --entrypoint=/beremiz/tests/tools/check_source.sh skvorl/beremiz-requirements --files-to-check files.lst

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```