[PATCH] user32/tests: Release window DCs consistently

[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=34763

Your paranoid android.


=== w8 (32 bit sysparams) ===
sysparams.c:2519: Test failed: Waiting for the WM_DISPLAYCHANGE message timed out
sysparams.c:2530: Test failed: Set bpp 32, but WM_DISPLAYCHANGE reported bpp -1

=== w864 (32 bit sysparams) ===
sysparams.c:291: SPI_SETSCREENSAVETIMEOUT failed for reason: 329. Indicating test failure and skipping remainder of test
sysparams.c:292: Test failed: SystemParametersInfoA: rc=0 err=329
sysparams.c:292: Test failed: SystemParametersInfoA: rc=0 err=329
sysparams.c:2519: Test failed: Waiting for the WM_DISPLAYCHANGE message timed out
sysparams.c:2530: Test failed: Set bpp 32, but WM_DISPLAYCHANGE reported bpp -1