gdi32/tests: Add tests for default font selection.

[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
http://testbot.winehq.org/JobDetails.pl?Key=16799

Your paranoid android.


=== W2KPROSP4 (32 bit font) ===
font.c:4145: Test failed: expected vertical face, got System

=== WXPPROSP3 (32 bit font) ===
font.c:4145: Test failed: expected vertical face, got System

=== W2K3R2SESP2 (32 bit font) ===
font.c:4145: Test failed: expected vertical face, got System