Allow late registration of file actions in public page

apps/files_sharing/js/public.js

@@ -33,6 +33,10 @@ OCA.Sharing.PublicApp = {
 		// regular actions
 		fileActions.merge(OCA.Files.fileActions);
 
+		// in case apps would decide to register file actions later,
+		// replace the global object with this one
+		OCA.Files.fileActions = fileActions;
+
 		this._initialized = true;
 		this.initialDir = $('#dir').val();