Do not show update dashboard image in mobile app

ui-ngx/src/app/modules/home/components/dashboard-page/dashboard-page.component.html

@@ -81,7 +81,7 @@
                   (click)="isFullscreen = !isFullscreen">
             <mat-icon>{{ isFullscreen ? 'fullscreen_exit' : 'fullscreen' }}</mat-icon>
           </button>
-          <button [fxShow]="currentDashboardId && !isEdit && isTenantAdmin() && displayUpdateDashboardImage()" mat-icon-button
+          <button [fxShow]="currentDashboardId && !isEdit && !isMobileApp && isTenantAdmin() && displayUpdateDashboardImage()" mat-icon-button
                   matTooltip="{{'dashboard.update-image' | translate}}"
                   matTooltipPosition="below"
                   (click)="updateDashboardImage($event)">