fix more bugs introduced by Angular 15

pdb-js/src/app/dashboard-page/new-dashboard/new-dashboard.component.html

@@ -1,10 +1,10 @@
 <h1 mat-dialog-title>Create a new dashboard</h1>
 <div mat-dialog-content>
-  <mat-form-field appearance="fill">
+  <mat-form-field class="pdb-form-full-width">
     <mat-label>Name</mat-label>
     <input matInput [(ngModel)]="data.name" #name>
   </mat-form-field>
-  <mat-form-field appearance="fill">
+  <mat-form-field class="pdb-form-full-width">
     <mat-label>Description</mat-label>
     <textarea matInput [(ngModel)]="data.description"></textarea>
   </mat-form-field>