Fixes race condition in authbase0 test case

There was an intentional change in realtime code regarding populating
`TokenDetails.issued` field based on `timestamp` field provided by the
request [1]. Starting from this change, provided `timestamp` field
can now used to set the `TokenDetails.issued` field. It is done to
"Make it easier to construct reliable tests for eg token expiry and
revocation, by controlling the timestamp we pass in."

This does, however, mean that in order for time-sensitive tests to work
properly and avoid race conditions, we need to always either set
`queryTime: true` or set `queryTime: false`. We need to ensure that we
use the same value everywhere, so that the realtime code returns
`TokenDetails.issued` based on consistent data when we need to check it.

This commit does that for the tests where we use `TokenDetails.issued`
in assertions.

Resolves #1578

[1] ably/realtime@359930d

test/realtime/auth.test.js

@@ -64,7 +64,7 @@ define(['ably', 'shared_helper', 'async', 'chai'], function (Ably, helper, async
      * Base token generation case
      */
     it('authbase0', function (done) {
-      var realtime = helper.AblyRealtime();
+      var realtime = helper.AblyRealtime({ queryTime: true });
       whenPromiseSettles(realtime.auth.requestToken(), function (err, tokenDetails) {
         if (err) {
           closeAndFinish(done, realtime, err);