Fix toggling GraphEdit's minimap with `minimap_enabled`

Fixes #53831.

(cherry picked from commit b1441bbcfce23a2a8dfd95779e3de4f20053e65c)

scene/gui/graph_edit.cpp

@@ -1631,6 +1631,7 @@ float GraphEdit::get_minimap_opacity() const {
 
 void GraphEdit::set_minimap_enabled(bool p_enable) {
 	minimap_button->set_pressed(p_enable);
+	_minimap_toggled();
 	minimap->update();
 }