[autotests] Fail faster on test which fails anyway
The .wait() in this case isn't really time depdenent, we just need to
process the event loop.
Given we know this tests fails, there's no point me waiting 30s.
Test Plan: Test failed, but faster
Reviewers: KWin, zzag
Reviewed By: KWin, zzag
Differential Revision: https://phabricator.kde.org/D19351