tdf#96482 Revert "Resolves: tdf#94069 call setVisible when setDesignMode is called"

This reverts commit a7816853.

tdf#94069 (freeze) has been corrected differently in master (5.2.alpha) anyway.

svx/source/fmcomp/fmgridif.cxx

@@ -1692,8 +1692,6 @@ void FmXGridPeer::setDesignMode(sal_Bool bOn) throw( RuntimeException, std::exce
             static_cast<FmGridControl*>(pWin)->SetDesignMode(bOn);
     }
 
-    setVisible(!bOn);
-
     if (bOn)
         DisConnectFromDispatcher();
     else