Fix an exception on wx-3.0-gtk3 in PLCOpenEditor when generating ST files.

On Python2.7 with WX3.0 and GTK3, an assertionError rises on generating a ST file if the name is already set. The first generation works without problems, if you generate the file a second one, PLCOpenEditor tries to open the file
save dialog with the pre entered name from last run. Then the following assertion pops up:

PyAssertionError: C++ assertion "volDummy.empty() && pathDummy.empty()" failed at ./src/common/filename.cpp(568) in Assign(): the file name shouldn't contain the path

This fix reduces the filepath of the ST file the to the filename. Now it works fine.

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image: skvorl/beremiz-requirements

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pipelines:

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  default:

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    - parallel:

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        - step:

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            name: Codestyle checks

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            script:

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              - ln -s /CanFestival-3 $BITBUCKET_CLONE_DIR/../CanFestival-3

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              - /usr/bin/python --version

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              - ./tests/tools/check_source.sh

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        - step:

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            name: Application tests

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            max-time: 10

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            script:

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              - ln -s /CanFestival-3 $BITBUCKET_CLONE_DIR/../CanFestival-3

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              - ./tests/tools/run_python_tests.sh

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