Fix a painting issue in the QGtkStyle statusbar
Fix a painting issue in the QGtkStyle statusbar

We should use the "statusbar" string when we draw the sizegrip.
Since gtkstatusbar is the only gtk widget using the paint_resize_grip
and it uses the "statusbar" string itself it should be safe to
assume this.

Task-number: 254535
Reviewed-by: rosch

igor-sfdc/qt-wk,radekp/qt,KDE/qt,radekp/qt,KDE/qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,KDE/qt,RLovelett/qt,radekp/qt,RLovelett/qt,RLovelett/qt,radekp/qt,igor-sfdc/qt-wk,radekp/qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,RLovelett/qt,KDE/qt,RLovelett/qt,radekp/qt,radekp/qt,igor-sfdc/qt-wk,radekp/qt,radekp/qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,KDE/qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,RLovelett/qt,RLovelett/qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,KDE/qt,RLovelett/qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,KDE/qt,RLovelett/qt,igor-sfdc/qt-wk,RLovelett/qt,KDE/qt,radekp/qt