urlmon/tests: Fixed up IUri tests

[Thomas Mullaly]

Fixed uri tests so they fail gracefully on machines with IE <7.

Also performed some code cleanup.

Test results here:
https://testbot.winehq.org/JobDetails.pl?Key=2010


---
 dlls/urlmon/tests/uri.c |   60
++++++++++++++++++++--------------------------
 1 files changed, 26 insertions(+), 34 deletions(-)
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