Do reload shared views

Fixes #4248

The magic introduced in #3686 caused the shared views not to be updated
properly. Thus we just overwrite the _onUrlChange method in the
sharedfilelist.

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

apps/files_sharing/js/sharedfilelist.js

@@ -382,6 +382,12 @@
 
 			// Sort by expected sort comparator
 			return files.sort(this._sortComparator);
+		},
+
+		_onUrlChanged: function(e) {
+			if (e && _.isString(e.dir)) {
+				this.changeDirectory(e.dir, false, true);
+			}
 		}
 	});