[NIFI-6168] require jquery in FDS dialog.service.js (#12)

This closes #12 
diff --git a/src/platform/core/dialogs/services/dialog.service.js b/src/platform/core/dialogs/services/dialog.service.js
index 9f3736f..807c69a 100644
--- a/src/platform/core/dialogs/services/dialog.service.js
+++ b/src/platform/core/dialogs/services/dialog.service.js
@@ -15,6 +15,7 @@
  * limitations under the License.
  */
 
+var $ = require('jquery');
 var ngCore = require('@angular/core');
 var ngMaterial = require('@angular/material');
 var FdsConfirmDialogComponent = require('@flow-design-system/confirm-dialog-component');