[PATCH] comctl32/trackbar: Update thumb immediately on key press

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://testbot.winehq.org/JobDetails.pl?Key=19639

Your paranoid android.


=== wvistau64 (32 bit trackbar) ===
trackbar.c:682: Test failed: got 36, expected 36

=== wvistau64 (64 bit trackbar) ===
trackbar.c:682: Test failed: got 36, expected 36