Fix AppTile context menu not always showing up when it has options (#11358)

* Fix AppTile context menu not always showing up when it has options

* Comment

* Update snapshots

src/components/views/elements/AppTile.tsx

@@ -134,8 +134,9 @@ export default class AppTile extends React.Component<IProps, IState> {
     private dispatcherRef?: string;
     private unmounted = false;
 
-    public constructor(props: IProps) {
+    public constructor(props: IProps, context: ContextType<typeof MatrixClientContext>) {
         super(props);
+        this.context = context; // XXX: workaround for lack of `declare` support on `public context!:` definition
 
         // Tiles in miniMode are floating, and therefore not docked
         if (!this.props.miniMode) {

test/components/views/elements/__snapshots__/AppTile-test.tsx.snap

@@ -139,6 +139,19 @@ exports[`AppTile for a pinned widget should render 1`] = `
             class="mx_Icon mx_Icon_12"
           />
         </div>
+        <div
+          aria-expanded="false"
+          aria-haspopup="true"
+          aria-label="Options"
+          class="mx_AccessibleButton mx_AppTileMenuBar_widgets_button"
+          role="button"
+          tabindex="0"
+          title="Options"
+        >
+          <div
+            class="mx_Icon mx_Icon_12"
+          />
+        </div>
       </span>
     </div>
     <div
@@ -201,6 +214,19 @@ exports[`AppTile for a pinned widget should render permission request 1`] = `
             class="mx_Icon mx_Icon_12"
           />
         </div>
+        <div
+          aria-expanded="false"
+          aria-haspopup="true"
+          aria-label="Options"
+          class="mx_AccessibleButton mx_AppTileMenuBar_widgets_button"
+          role="button"
+          tabindex="0"
+          title="Options"
+        >
+          <div
+            class="mx_Icon mx_Icon_12"
+          />
+        </div>
       </span>
     </div>
     <div
@@ -341,6 +367,19 @@ exports[`AppTile preserves non-persisted widget on container move 1`] = `
                   class="mx_Icon mx_Icon_12"
                 />
               </div>
+              <div
+                aria-expanded="false"
+                aria-haspopup="true"
+                aria-label="Options"
+                class="mx_AccessibleButton mx_AppTileMenuBar_widgets_button"
+                role="button"
+                tabindex="0"
+                title="Options"
+              >
+                <div
+                  class="mx_Icon mx_Icon_12"
+                />
+              </div>
             </span>
           </div>
           <div