Fixed issue #834. Union Tool - Pieces can't be moved after undo union details.

--HG--
branch : develop

src/libs/vtools/undocommands/deletepiece.cpp

@@ -121,6 +121,7 @@ void DeletePiece::redo()
         m_tool = qobject_cast<VToolSeamAllowance*>(VAbstractPattern::getTool(nodeId));
         SCASSERT(not m_tool.isNull());
         m_tool->DisconnectOutsideSignals();
+        m_tool->EnableToolMove(true);
         m_tool->hide();
 
         m_scene->removeItem(m_tool);