msi/tests: Move a couple of tests from install.c to msi.c.

[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=24381

Your paranoid android.


=== WNT4WSSP6 (32 bit install) ===
install.c:5673: Test failed: Per-user icon file isn't where it's expected (C:\WINNT\Profiles\Default User\Application Data\Microsoft\Installer\{7DF88A49-996F-4EC8-A022-BF956F9B2CBB}\testicon)