fix(widget-select): drop xs select fallback on top-level mode toggle

The Installed / IoT Hub toggle now carries icon templates that don't
collapse cleanly into a mat-select on xs viewports — keep the toggle
buttons at every breakpoint instead.

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

@@ -22,7 +22,6 @@
         <tb-toggle-select class="tb-top-level-widget-mode-toggle"
                           appearance="fill-invert"
                           [disablePagination]="true"
-                          selectMediaBreakpoint="xs"
                           [(ngModel)]="selectWidgetMode">
           <tb-toggle-option value="installed" [template]="installedWidgetsOption"></tb-toggle-option>
           <tb-toggle-option value="iotHub" [template]="iotHubWidgetsOption"></tb-toggle-option>