user32/tests: Make use of todo_wine_if().

[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=24730

Your paranoid android.


=== w864 (32 bit msg) ===
msg.c:6482: Test failed: Update region shouldn't be empty
msg.c:6715: Test failed: InvalidateErase: 0: the msg sequence is not complete: expected 0085 - actual 0000
msg.c:6717: Test failed: Paint: 0: the msg sequence is not complete: expected 000f - actual 0000
msg.c:6488: Test failed: Regions are different
msg.c:6488: Test failed: Regions are different
msg.c:6488: Test failed: Regions are different

=== w1064 (32 bit msg) ===
msg.c:6482: Test failed: Update region shouldn't be empty
msg.c:6715: Test failed: InvalidateErase: 0: the msg sequence is not complete: expected 0085 - actual 0000
msg.c:6717: Test failed: Paint: 0: the msg sequence is not complete: expected 000f - actual 0000
msg.c:6488: Test failed: Regions are different
msg.c:6488: Test failed: Regions are different
msg.c:6488: Test failed: Regions are different

=== w864 (64 bit msg) ===
msg.c:6482: Test failed: Update region shouldn't be empty
msg.c:6715: Test failed: InvalidateErase: 0: the msg sequence is not complete: expected 0085 - actual 0000
msg.c:6717: Test failed: Paint: 0: the msg sequence is not complete: expected 000f - actual 0000
msg.c:6488: Test failed: Regions are different
msg.c:6488: Test failed: Regions are different
msg.c:6488: Test failed: Regions are different
msg.c:10053: Test failed: SendMessageTimeout succeeded
msg.c:10054: Test failed: WmEmptySeq: 0: the msg sequence is not complete: expected 0000 - actual 0400

=== w1064 (64 bit msg) ===
msg.c:6482: Test failed: Update region shouldn't be empty
msg.c:6715: Test failed: InvalidateErase: 0: the msg sequence is not complete: expected 0085 - actual 0000
msg.c:6717: Test failed: Paint: 0: the msg sequence is not complete: expected 000f - actual 0000
msg.c:6488: Test failed: Regions are different
msg.c:6488: Test failed: Regions are different
msg.c:6488: Test failed: Regions are different
msg.c:7437: Test failed: destroy child on thread exit: 3: the msg sequence is not complete: expected 0000 - actual 001a