fix(desk-tool): check for 'discardDraft' permission instead of 'delet…

…e' in the DiscardDraft document action

Currently the DiscardDraft document action is checking for 'delete' permission, which requires 'update' permissions on both the draft and the published document and ends up inadvertently disabling the "Discard draft"-button for users that indeed have access to update the draft.

packages/@sanity/desk-tool/src/actions/DiscardChangesAction.tsx

@@ -22,7 +22,7 @@ export const DiscardChangesAction: DocumentActionComponent = ({
 }) => {
   const {discardChanges}: any = useDocumentOperation(id, type)
   const [isConfirmDialogOpen, setConfirmDialogOpen] = useState(false)
-  const deleteDraftPermission = useCheckDocumentPermission(id, type, 'delete')
+  const deleteDraftPermission = useCheckDocumentPermission(id, type, 'discardDraft')
   const {value: currentUser} = useCurrentUser()
 
   const handleConfirm = useCallback(() => {