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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#! gmake

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yml := ../../yml2

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ysl2files := $(wildcard *.ysl2)

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xsltfiles := $(patsubst %.ysl2, %.xslt, $(ysl2files))

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all:$(xsltfiles)

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%.xslt: %.ysl2 yslt_noindent.yml2

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	$(yml)/yml2c -I $(yml) $< -o $@.tmp

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	xmlstarlet fo $@.tmp > $@

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	rm $@.tmp

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clean:

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	rm -f $(xsltfiles)