QmlDesigner: Remove workaround

Because we can now commit a invalid transaction so we don't need to create
a new transaction.

Change-Id: I91bcd403d6a5a73df1c1b0b74f06eb3ff7423caa
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

src/plugins/qmldesigner/components/formeditor/movetool.cpp

@@ -190,7 +190,6 @@ void MoveTool::keyReleaseEvent(QKeyEvent *keyEvent)
     }
 
     if (!keyEvent->isAutoRepeat()) {
-        m_moveManipulator.beginRewriterTransaction();
         m_moveManipulator.clear();
 //        m_selectionIndicator.show();
         m_resizeIndicator.show();