Make filesystem header a link if it is an app

src/js/filemanager.js

@@ -78,6 +78,7 @@ app.controller('FileManagerController', ['$scope', '$translate', '$timeout', 'Cl
     $scope.sortProperty = 'fileName';
     $scope.view = 'fileTree';
     $scope.volumes = [];
+    $scope.applicationLink = '';
 
     $scope.owners = [
         { name: 'cloudron', value: 1000 },
@@ -1041,6 +1042,7 @@ app.controller('FileManagerController', ['$scope', '$translate', '$timeout', 'Cl
                     case 'app':
                         $scope.title = result.label || result.fqdn;
                         $scope.rootDirLabel = '/app/data/';
+                        $scope.applicationLink = 'https://' + result.fqdn;
                         break;
                     case 'volume':
                         $scope.title = result.name;