Revert "force saving of current scene, while not explicitely asked to not"

This reverts commit 08f7b3c1d5.

src/board/UBBoardController.h

@@ -160,7 +160,7 @@ class UBBoardController : public UBDocumentContainer
         }
         qreal currentZoom();
         void persistViewPositionOnCurrentScene();
-        void persistCurrentScene(bool isAnAutomaticBackup = false, bool forceImmediateSave = true);
+        void persistCurrentScene(bool isAnAutomaticBackup = false, bool forceImmediateSave = false);
         void showNewVersionAvailable(bool automatic, const UBVersion &installedVersion, const UBSoftwareUpdate &softwareUpdate);
         void setBoxing(QRect displayRect);
         void setToolbarTexts();