msi: Reduce destination file name used in the MoveFiles action to the long file name.

[Rob Shearman]

Add a test for this behaviour.
---
 dlls/msi/action.c        |   22 ++++++++++++++++------
 dlls/msi/tests/install.c |    4 ++++
 2 files changed, 20 insertions(+), 6 deletions(-)
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