Correction to own previous commit: Add missing break

Small mistake in 88400f0c03.
Not having this break would be harmless, but we can avoid some unnecessary work
with it.

source/blender/editors/space_file/space_file.c

@@ -474,6 +474,7 @@ static void file_listener(const wmSpaceTypeListenerParams *params)
           file_reset_filelist_showing_main_data(area, sfile);
           break;
       }
+      break;
     }
     case NC_ASSET: {
       switch (wmn->action) {