[autotests] Fix failing of testDontCrashReinitializeCompositor
Currently, testDontCrashReinitializeCompositor is unstable because it
doesn't take into account that effects can be loaded asynchronously.
In general, we don't need all default effects in this test, so let's
Test Plan: This should fix ASan issues.
Reviewers: KWin, davidedmundson
Reviewed By: KWin, davidedmundson
Differential Revision: https://phabricator.kde.org/D17386