Summary:
Use QTRY_VERIFY instead of qWait + QVERIFY to avoid useless waits.
Effects like scale or glide don't last longer than 200ms.

Test Plan:
Before:
    $ dbus-run-session ctest -R testToplevelOpenCloseAnimation
    Test project /home/vlad/Workspace/KDE/build/kde/workspace/kwin
        Start 123: kwin-testToplevelOpenCloseAnimation
    1/2 Test #123: kwin-testToplevelOpenCloseAnimation ...............   Passed    6.43 sec
        Start 124: kwin-testToplevelOpenCloseAnimation-waylandonly
    2/2 Test #124: kwin-testToplevelOpenCloseAnimation-waylandonly ...   Passed    6.33 sec

    100% tests passed, 0 tests failed out of 2

    Total Test time (real) =  12.76 sec

After:
    $ dbus-run-session ctest -R testToplevelOpenCloseAnimation
    Test project /home/vlad/Workspace/KDE/build/kde/workspace/kwin
        Start 123: kwin-testToplevelOpenCloseAnimation
    1/2 Test #123: kwin-testToplevelOpenCloseAnimation ...............   Passed    2.05 sec
        Start 124: kwin-testToplevelOpenCloseAnimation-waylandonly
    2/2 Test #124: kwin-testToplevelOpenCloseAnimation-waylandonly ...   Passed    2.00 sec

    100% tests passed, 0 tests failed out of 2

    Total Test time (real) =   4.05 sec

Reviewers: #kwin, davidedmundson

Reviewed By: #kwin, davidedmundson

Subscribers: davidedmundson, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D17989