filemanager: reset selection if directory has changed

src/js/filemanager.js

@@ -144,6 +144,7 @@ app.controller('FileManagerController', ['$scope', '$translate', '$timeout', 'Cl
 
             if (entry.isDirectory) {
                 $scope.cwd = path;
+                $scope.selected = [];
 
                 // refresh will set busy to false once done
                 $scope.refresh();