pygi-convert.sh: Drop window -> get_window() conversion
pygi-convert.sh: Drop window -> get_window() conversion

It is doing more harm than good for projects which use things like self.window.

choeger/pygobject-cmake,davibe/pygobject,Distrotech/pygobject,nzjrs/pygobject,choeger/pygobject-cmake,davibe/pygobject,thiblahute/pygobject,sfeltman/pygobject,choeger/pygobject-cmake,davibe/pygobject,davidmalcolm/pygobject,thiblahute/pygobject,davidmalcolm/pygobject,pexip/pygobject,davibe/pygobject,MathieuDuponchelle/pygobject,Distrotech/pygobject,GNOME/pygobject,jdahlin/pygobject,nzjrs/pygobject,sfeltman/pygobject,Distrotech/pygobject,jdahlin/pygobject,thiblahute/pygobject,MathieuDuponchelle/pygobject,alexef/pygobject,pexip/pygobject,nzjrs/pygobject,GNOME/pygobject,jdahlin/pygobject,sfeltman/pygobject,alexef/pygobject,GNOME/pygobject,MathieuDuponchelle/pygobject,davidmalcolm/pygobject,pexip/pygobject,Distrotech/pygobject,alexef/pygobject