[client-app] Make sure we retry delta connection when reauthing account

Summary: See title

Test Plan: manual

Reviewers: halla, evan

Reviewed By: halla, evan

Differential Revision: https://phab.nylas.com/D4176

packages/client-app/src/flux/stores/account-store.es6

@@ -267,6 +267,8 @@ class AccountStore extends NylasStore {
       const account = this._accounts[existingIdx]
       account.syncState = Account.SYNC_STATE_RUNNING
       account.fromJSON(json)
+      // Restart the connection in case account credentials have changed
+      Actions.retryDeltaConnection()
     }
 
     this._save()