Render screen shaking in towers

It's really obvious that screen shaking is not processed in towers if
you bring up the pause menu then quickly quicksave and bring it back
down. The screen won't shake, but it will suddenly start shaking if you
exit the tower, finishing off the stalled screenshake timer.

desktop_version/src/titlerender.cpp

@@ -2933,7 +2933,15 @@ void towerrender(Graphics& dwgfx, Game& game, mapclass& map, entityclass& obj, U
         dwgfx.flashlight();
     }
 
-    dwgfx.render();
+    if (game.screenshake > 0 && !game.noflashingmode)
+    {
+        game.screenshake--;
+        dwgfx.screenshake();
+    }
+    else
+    {
+        dwgfx.render();
+    }
 }
 
 void teleporterrender(Graphics& dwgfx, Game& game, mapclass& map, entityclass& obj, UtilityClass& help)