[RESEND 4/4] user32/combo: Properly handle WM_CTLCOLOR*

[Marvin]

Hi,

While running your changed tests, 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=58902

Your paranoid android.


=== debian10 (32 bit Chinese:China report) ===

user32:
msg.c:8774: Test failed: WaitForSingleObject failed 102
msg.c:8780: Test failed: destroy child on thread exit: 0: the msg 0x0082 was expected, but got msg 0x000f instead
msg.c:8780: Test failed: destroy child on thread exit: 1: the msg 0x000f was expected, but got msg 0x0014 instead
msg.c:8780: Test failed: destroy child on thread exit: 2: the msg sequence is not complete: expected 0014 - actual 0000