Increase query execution time for the test case in max_time_ms.js that expects it to hit the time limit

This targets the first case in max_time_ms.js, starting on line 24. This test runs a ~300ms query with a 100ms time limit. We should make the query take much longer to rule out something finicky happening due to the small difference between execution time and timeout limit. If it fails again we can be more confident that something wrong occurred in the query system.