notify and notifyThreshold input added

ng/src/app/components/service-check-form/service-check-form.component.html

@@ -39,7 +39,7 @@
     <div class="row mb-2">
       <label [for]="'NotifyThreshold_' + serviceCheck.id" class="col-sm-3 col-form-label">Notify Threshold</label>
       <div class="col-sm-9">
-        <input type="text" formControlName="notifyThreshold" class="form-control" [id]="'NotifyThreshold_' + serviceCheck.id" />
+        <input type="number" formControlName="notifyThreshold" class="form-control" [id]="'NotifyThreshold_' + serviceCheck.id" />
       </div>
     </div>
   </div>