Fix problem with decreasing size of StatusToolBar when tools are removed from toolbar.

StatusToolBar - toolbar with tool to build, clear, connect, ...
This problem appears only in python-wxgtk3.0. In python-wxgtk2.8 there
was not such problem.

If call StatusToolBar.SetMinSize(wx.DefaultSize), all is working, but
following warning message appears:

(Beremiz.py:15155): Gtk-WARNING **: 18:42:24.115: Negative content
width -6 (allocation 1, extents 4x3) while allocating gadget (node
toolbar, owner GtkToolbar)

To avoid that StatusToolBar.GetToolBitmapSize() is used instead of wx.DefaultSize

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# pylint: disable=undefined-variable

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from __future__ import absolute_import

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from svgui.pyjs.jsonrpc.jsonrpc import JSONRPCServiceBase

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class JSONRPCService(JSONRPCServiceBase):

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    def serve(self):

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        return self.process(request.body.read())

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    def __call__(self, func):

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        self.methods[func.__name__] = func

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        return func