[PATCH] user32/tests: Make the test_char_from_pos() failures more informative.

[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=114315

Your paranoid android.


=== w10pro64_en_AE_u8 (64 bit report) ===

user32:
edit.c:1161: Test failed: 4/4/8: expected 1 got 0
edit.c:1179: Test failed: 282/282/286: expected 1 got 0
edit.c:1197: Test failed: 143/143/147: expected 1 got 0