zoneless + fix signal form refresh

packages/frontend/src/app/components/delete-member-dialog/delete-member-dialog.component.html

@@ -1,4 +1,4 @@
-<form>
+<form (submit)="submit(); $event.preventDefault()">
     <p>Name: {{ member.vorname }} {{ member.nachname }}</p>
     <p>Passnummer: {{ member.passnummer }}</p>
     <p>Geburtsdatum: {{ member.geburtsdatum | datePipe }}</p>
@@ -11,7 +11,5 @@
             [for]="picker"></mat-datepicker-toggle>
         <mat-datepicker #picker></mat-datepicker>
     </mat-form-field>
-    <button mat-raised-button color="primary" (click)="submit()">
-        Speichern
-    </button>
+    <button mat-raised-button color="primary" type="submit">Speichern</button>
 </form>