Fix flaky test/slow/async/resume_throw_hook_timeout.php
Summary:
Depending on where the timeout occurs, the fatal either reports the location or
it does not. The `%s` was intended to handle this optionality, but apparently
it does not match an empty string, which `%S` does, so let's use that.
Not sure why this test used to work until recently though. I remember observing
both situations locally when I added the test and `%s` seemed to work.
Reviewed By: ottoni
Differential Revision:
D25158058
fbshipit-source-id:
7523456e847b3ff00d1b7aa16f7ee1ce9da1a1e4