Move unassign button to avatar menu

Signed-off-by: Julius Härtl <jus@bitgrid.net>

js/directive/avatar.js

@@ -32,6 +32,7 @@ app.directive('avatar', function() {
 				$(element).contactsMenu(value, 0, $(element).parent());
 			}
 			$(element).avatar(value, 32, false, false, false, attr.displayname);
-		}
+		},
+		controller: function () {}
 	};
 });