Fix app init wait for backup on first link

Co-authored-by: Fedor Indutny <79877362+indutny-signal@users.noreply.github.com>

ts/textsecure/AccountManager.ts

@@ -899,6 +899,7 @@ export default class AccountManager extends EventTarget {
   private async createAccount(
     options: CreateAccountOptionsType
   ): Promise<void> {
+    this.dispatchEvent(new Event('startRegistration'));
     const registrationBaton = this.server.startRegistration();
     try {
       await this.doCreateAccount(options);