fix issue where right-click did not exit demolish mode

src/ui/GameWorldView.cpp

@@ -1262,6 +1262,7 @@ void GameWorldView::mousePressEvent(QMouseEvent* event)
         {
             if (m_builderType.has_value())        { exitBuilderMode(); }
             else if (m_blueprintMode.has_value()) { exitBlueprintMode(); }
+            else if (m_demolishMode)              { toggleDemolishMode(); }
         }
         return;
     }