117287: Removed remaining observable function calls from the HTML templates

src/app/submission/form/section-add/submission-form-section-add.component.html

@@ -2,18 +2,18 @@
      #sectionAdd="ngbDropdown"
      placement="bottom-right"
      class="d-inline-block"
-     [ngClass]="{'w-100': windowService.isXs()}">
+     [ngClass]="{'w-100': isXs$}">
   <button class="btn btn-outline-primary dropdown-toggle"
           id="sectionControls"
           [disabled]="!(hasSections$ | async)"
-          [ngClass]="{'w-100': (windowService.isXs() | async)}"
+          [ngClass]="{'w-100': (isXs$ | async)}"
           ngbDropdownToggle>
           {{ 'submission.sections.general.add-more' | translate }} <i class="fa fa-plus" aria-hidden="true"></i>
   </button>
   <div ngbDropdownMenu
        class="sections-dropdown-menu"
        aria-labelledby="sectionControls"
-       [ngClass]="{'w-100': (windowService.isXs() | async)}">
+       [ngClass]="{'w-100': (isXs$ | async)}">
     <button class="dropdown-item disabled" *ngIf="!(hasSections$ | async)">
       {{ 'submission.sections.general.no-sections' | translate }}
     </button>