Fixed VectorDataWidget bool delegate for PySide.
Fixed VectorDataWidget bool delegate for PySide.

PySide seems to have a few deficiencies in this area compared to PyQt - see comments for details.

johnhaddon/gaffer,ivanimanishi/gaffer,cedriclaunay/gaffer,andrewkaufman/gaffer,hradec/gaffer,ivanimanishi/gaffer,lucienfostier/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,davidsminor/gaffer,goddardl/gaffer,davidsminor/gaffer,ivanimanishi/gaffer,ImageEngine/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,lucienfostier/gaffer,davidsminor/gaffer,ImageEngine/gaffer,boberfly/gaffer,hradec/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,appleseedhq/gaffer,cedriclaunay/gaffer,goddardl/gaffer,boberfly/gaffer,appleseedhq/gaffer,chippey/gaffer,hradec/gaffer,GafferHQ/gaffer,boberfly/gaffer,cedriclaunay/gaffer,GafferHQ/gaffer,boberfly/gaffer,johnhaddon/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,hradec/gaffer,goddardl/gaffer,chippey/gaffer,cedriclaunay/gaffer,ImageEngine/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,hradec/gaffer,chippey/gaffer,andrewkaufman/gaffer,chippey/gaffer,ImageEngine/gaffer,davidsminor/gaffer,goddardl/gaffer,ivanimanishi/gaffer,appleseedhq/gaffer,johnhaddon/gaffer