Remove more unused functions

js/background.js

@@ -331,10 +331,6 @@
         $('.dark-overlay').on('click', () => $('.dark-overlay').remove());
       },
       removeDarkOverlay: () => $('.dark-overlay').remove(),
-      deleteAllData: () => {
-        const clearDataView = new window.Whisper.ClearDataView().render();
-        $('body').append(clearDataView.el);
-      },
 
       shutdown: async () => {
         // Stop background processing

ts/global.d.ts

@@ -4,7 +4,6 @@ interface Window {
 
   Events: any;
   Lodash: any;
-  deleteAllData: any;
   clearLocalData: any;
   getAccountManager: any;
   getConversations: any;