msi: Only remove environment strings that were added on install.

[Hans Leidekker]

---
 dlls/msi/action.c       | 63 ++++++++++++++++++++++++++++++++++++++-----
 dlls/msi/tests/action.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 126 insertions(+), 8 deletions(-)

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