Re-enable link-and-sync in Alpha

ts/textsecure/Provisioner.ts

@@ -78,7 +78,10 @@ export class Provisioner {
   private state: StateType = { step: Step.Idle };
   private wsr: IWebSocketResource | undefined;
 
-  constructor(private readonly server: WebAPIType) {}
+  constructor(
+    private readonly server: WebAPIType,
+    private readonly appVersion: string
+  ) {}
 
   public close(error = new Error('Provisioner closed')): void {
     try {
@@ -242,7 +245,7 @@ export class Provisioner {
         .toAppUrl({
           uuid,
           pubKey: Bytes.toBase64(pubKey),
-          capabilities: isLinkAndSyncEnabled() ? ['backup'] : [],
+          capabilities: isLinkAndSyncEnabled(this.appVersion) ? ['backup'] : [],
         })
         .toString();