don't allow flip handles for subflows

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/context-menu/block-context-menu.tsx

@@ -118,7 +118,7 @@ export function BlockContextMenu({
             {getToggleEnabledLabel()}
           </PopoverItem>
         )}
-        {!allNoteBlocks && (
+        {!allNoteBlocks && !isSubflow && (
           <PopoverItem
             disabled={disableEdit}
             onClick={() => {