fix(files): use window._nc_navigation in legacy file

`OCP.Files.Navigation` is undefined.

Signed-off-by: Max <[email protected]>

Author: max-nextcloud

apps/files/js/app.js

@@ -146,7 +146,7 @@
 
 			window._nc_event_bus.emit('files:legacy-view:initialized', this);
 
-			this.navigation = OCP.Files.Navigation
+			this.navigation = window._nc_navigation
 		},
 
 		/**