GTK: don't raise graphics window in HideTextEditControl().

This screws up window managers like fvwm, which don't respect
the ICCCM "Keep Above" flag. I don't remember why it's there and
it doesn't appear that removing it has any ill effect.

src/gtk/gtkmain.cpp

@@ -1426,7 +1426,6 @@ void ShowTextEditControl(int x, int y, const std::string &val) {
 
 void HideTextEditControl(void) {
     TW->get_overlay().stop_editing();
-    GW->raise();
 }
 
 bool TextEditControlIsVisible(void) {