[msi/tests] Fix a test for systems with %TEMP% being less than 2 levels deep

[Paul Vriens]

Hi,

This fixes a longstanding known issue on NT4 boxes that have %TEMP% only 1 level
deep (by default).

These tests now succeed even when %TEMP% is set to 'C:'.

The basic tests that this testblock performed were:

1. relative msifile "..\msifile.msi"
2. absolute msifile "c:\%TEMP%\msifile.msi"
3. msifile "%TEMP%\msifile.msi" run from the root directory (extracted from %TEMP%).

This patch still does the same thing. The only difference is that if %TEMP% is
set to the systemdrive (which is not recommended ;)) the last test is not very
useful.

Changelog
   Fix a test for systems with %TEMP% being less than 2 levels deep

-- 
Cheers,

Paul.

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