Replace mat-button with synonym matButton for coherence #11936

This makes it easier to select any button in e2e tests

Author: PowerKiKi

client/app/front-office/components/donation/donation.component.html

@@ -17,6 +17,6 @@ <h2 mat-dialog-title>Faire un don</h2>
 </mat-dialog-content>
 
 <mat-dialog-actions align="end">
-    <button mat-dialog-close mat-button>Annuler</button>
+    <button mat-dialog-close matButton>Annuler</button>
     <button matButton="filled" [mat-dialog-close]="amount.value" [disabled]="!amount.valid">Valider</button>
 </mat-dialog-actions>

client/app/front-office/front-office.component.html

@@ -84,7 +84,7 @@
                         <button mat-menu-item (click)="currencyService.setCurrency(Currency.EUR)">Europe (EUR)</button>
                     </mat-menu>
                     @if (viewer?.role === UserRole.administrator) {
-                        <a routerLink="/admin" mat-button>Administration</a>
+                        <a routerLink="/admin" matButton>Administration</a>
                     }
                     @for (item of topNavigation; track item) {
                         <a matButton [routerLink]="item.link">{{ item.display }}</a>