[PATCH] user32/tests: Add BM_SETIMAGE style check tests.

[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=37206

Your paranoid android.


=== wvistau64_zh_CN (32 bit msg) ===
msg.c:5084: Test failed: ShowWindow(SW_RESTORE):overlapped: 18: the msg sequence is not complete: expected 0000 - actual 0088