(svn r13024) -Codechange: do not use WE_MOUSELOOP when WE_TICK suffices, rename WE_4 to something more descriptive and correct some (completely incorrect) comments.

src/airport_gui.cpp

@@ -230,7 +230,7 @@ static void BuildAirportPickerWndProc(Window *w, WindowEvent *e)
 			}
 		} break;
 
-		case WE_MOUSELOOP: {
+		case WE_TICK: {
 			if (WP(w, def_d).close) {
 				delete w;
 				return;