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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include yslt.yml2

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in xsl {

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    decl istylesheet (

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        *output="xml",

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        version="1.0",

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        xmlns:xsl="http://www.w3.org/1999/XSL/Transform",

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        xmlns:exsl='http://exslt.org/common',

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        extension-element-prefixes='exsl'

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    ) alias stylesheet {

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        output *output;

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        content;

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    };

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    decl template(match) {

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        content;

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    };

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    decl function(name) alias template {

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        content;

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    };

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    decl call(name) alias call-template {

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        content;

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    };

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    decl apply(select) alias apply-templates {

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        content;

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    };

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}

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