First quick check if lastEmittedState and appState are different

Resolves brave#10195

Auditors: @bridiver @bbondy

Test Plan:
- open two windows
- add bookmark in one
- bookmark should appear in both bookmark toolbars

js/stores/appStore.js

@@ -78,7 +78,7 @@ class AppStore extends EventEmitter {
   }
 
   emitChanges () {
-    if (this.lastEmittedState) {
+    if (this.lastEmittedState && this.lastEmittedState !== appState) {
       const d = diff(this.lastEmittedState, appState)
       if (!d.isEmpty()) {
         BrowserWindow.getAllWindows().forEach((wnd) => {