fix(files): use correct API for action displayName in batch actions

The displayName call was still using the old positional arguments
(nodes, view) instead of the new object parameter format (actionContext)
after the @nextcloud/files 4.0.0 update.

Signed-off-by: nfebe <fenn25.fn@gmail.com>

apps/files/src/components/FilesListTableHeaderActions.vue

@@ -287,7 +287,7 @@ export default defineComponent({
 
 			let displayName = action.id
 			try {
-				displayName = action.displayName(this.nodes, this.currentView)
+				displayName = action.displayName(this.actionContext)
 			} catch (error) {
 				logger.error('Error while getting action display name', { action, error })
 			}