remove unnecessary handler macro from events::raise_draw_event

After discussion on irc, it seems that this function doesn't
throw end level or end turn exceptions, and some play testing
suggests that removing the handler macros here is alright.

src/playsingle_controller.cpp

@@ -373,15 +373,15 @@ possible_end_play_signal playsingle_controller::play_scenario_init(end_level_dat
 		past_prestart = true;
 		LOG_NG << "first_time..." << (recorder.is_skipping() ? "skipping" : "no skip") << "\n";
 
-		HANDLE_END_PLAY_SIGNAL( events::raise_draw_event() );
+		events::raise_draw_event();
 		HANDLE_END_PLAY_SIGNAL( fire_start(true) );
 		gui_->recalculate_minimap();
 	}
 	else
 	{
 		init_gui();
 		past_prestart = true;
-		HANDLE_END_PLAY_SIGNAL( events::raise_draw_event() );
+		events::raise_draw_event();
 		HANDLE_END_PLAY_SIGNAL( fire_start(false) );
 		gui_->recalculate_minimap();
 	}
@@ -626,7 +626,7 @@ possible_end_play_signal playsingle_controller::play_turn()
 	resources::whiteboard->on_gamestate_change();
 	gui_->new_turn();
 	gui_->invalidate_game_status();
-	HANDLE_END_PLAY_SIGNAL ( events::raise_draw_event() );
+	events::raise_draw_event();
 
 	LOG_NG << "turn: " << turn() << "\n";