wrap pollEvent() to guarantee all loops handle modifiers (#477)

src/pcedit/pc.main.cpp

@@ -214,7 +214,7 @@ void handle_events() {
 			menuChoiceId=-1;
 		}
 #endif
-		while(mainPtr.pollEvent(currentEvent)) handle_one_event(currentEvent);
+		while(pollEvent(mainPtr, currentEvent)) handle_one_event(currentEvent);
 
 		redraw_everything();
 
@@ -225,9 +225,6 @@ void handle_events() {
 
 void handle_one_event (const sf::Event& event) {
 	
-	// If it's just a modifier key, update the state
-	if(kb.handleModifier(event)) return;
-	
 	// Check if the menubar wants to handle this event.
 	if(menuBarProcessEvent(event)) return;