Add litho accessibility rendering to Flipper accessibility mode

Summary: This is a re-do of D9720987.  Now that the Litho version has been bumped to 20 in D12838684, this diff can land safely.

Reviewed By: danielbuechele

Differential Revision: D12969979

fbshipit-source-id: b12d14e3b292d8cd110967f84f770f3725a800de

src/plugins/layout/index.js

@@ -548,14 +548,13 @@ export default class Layout extends FlipperPlugin<InspectorState> {
   }
 
   initAX() {
-    // TODO: uncomment once Litho open source updates
-    // this.client
-    //   .call('shouldShowLithoAccessibilitySettings')
-    //   .then((showLithoAccessibilitySettings: boolean) => {
-    //     this.setState({
-    //       showLithoAccessibilitySettings,
-    //     });
-    //   });
+    this.client
+      .call('shouldShowLithoAccessibilitySettings')
+      .then((showLithoAccessibilitySettings: boolean) => {
+        this.setState({
+          showLithoAccessibilitySettings,
+        });
+      });
 
     performance.mark('InitAXRoot');
     this.client.call('getAXRoot').then((element: Element) => {