[3/6] user32/tests: Reenable test function for WM_GETTEXT.

[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=10317

Your paranoid android.


=== w2008s64 (64 bit win) ===
win.c:3367: Test failed: hwnd 00000000000100F4 message 0118