GUACAMOLE-724: Update calls to ManagedFilesystem.getInstance() to provide relevant ManagedClient.

guacamole/src/main/frontend/src/app/client/types/ManagedClient.js

@@ -591,7 +591,7 @@ angular.module('client').factory('ManagedClient', ['$rootScope', '$injector',
         // Handle any received filesystem objects
         client.onfilesystem = function fileSystemReceived(object, name) {
             $rootScope.$apply(function exposeFilesystem() {
-                managedClient.filesystems.push(ManagedFilesystem.getInstance(object, name));
+                managedClient.filesystems.push(ManagedFilesystem.getInstance(managedClient, object, name));
             });
         };
 

guacamole/src/main/frontend/src/app/client/types/ManagedFilesystem.js

@@ -170,6 +170,10 @@ angular.module('client').factory('ManagedFilesystem', ['$rootScope', '$injector'
      * and human-readable name. Upon creation, a request to populate the
      * contents of the root directory will be automatically dispatched.
      *
+     * @param {ManagedClient} client
+     *     The client that originally received the "filesystem" instruction
+     *     that resulted in the creation of this ManagedFilesystem.
+     *
      * @param {Guacamole.Object} object
      *     The Guacamole.Object defining the filesystem.
      *