msi/tests: Create only a single restore point

[Ge van Geldorp]

When running the msi:package test on Win7, a whole bunch of restore points
was created. This caused the test to take more than 2 min, causing it to
be marked as timed-out. Prevent this by only taking a single restore
point, just like the msi:install test.

Changelog:
  msi/tests: Create only a single restore point

---
 dlls/msi/tests/package.c |   48
++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 48 insertions(+), 0 deletions(-)



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