coverity#705257 gold, Missing break in switch

this is the image map window, I see that indeed toggling a shape
active/inactive in the image mapwindow makes it change layer
to the front for no good reason

Change-Id: If6556e8f21dee2b0f7c750d460490d4e03fc0c02

svx/source/dialog/imapwnd.cxx

@@ -725,6 +725,7 @@ IMPL_LINK( IMapWindow, MenuSelectHdl, Menu*, pMenu )
                 SetCurrentObjState( bNewState );
                 UpdateInfo( false );
             }
+            break;
 
             case( MN_FRAME_TO_TOP ):
                 pView->PutMarkedToTop();