menubar writer: remove designmode from edit

designmode is for forms and available already there

Change-Id: I460b49bba8dbfd1e2f3a91b1478f5414fe09db86
Reviewed-on: https://gerrit.libreoffice.org/56060
Tested-by: Jenkins
Reviewed-by: Heiko Tietze <tietze.heiko@gmail.com>

sw/uiconfig/swriter/menubar/menubar.xml

@@ -161,7 +161,6 @@
       <menu:menuitem menu:id=".uno:ObjectMenue"/>
       <menu:menuitem menu:id=".uno:ChangeDatabaseField"/>
       <menu:menuseparator/>
-      <menu:menuitem menu:id=".uno:SwitchControlDesignMode"/>
       <menu:menuitem menu:id=".uno:EditDoc"/>
     </menu:menupopup>
   </menu:menu>