Bug 1726389 - Properly initialize matrix crypto store. r=clokep

Differential Revision: https://phabricator.services.mozilla.com/D122976

--HG--
extra : amend_source : d43fd798798c618c9d0b5a330dd9d38a19937988

chat/protocols/matrix/matrix.jsm

@@ -1058,7 +1058,7 @@ MatrixAccount.prototype = {
 
     const opts = this.getClientOptions();
 
-    await opts.store.startup();
+    await Promise.all([opts.store.startup(), opts.cryptoStore.startup()]);
     this._client = MatrixSDK.createClient(opts);
     if (this._client.isLoggedIn()) {
       this.startClient();