advapi32: Use the open_for_write parameter to open_cred_mgr_key and fix get_cred_mgr_encryption_key to not need KEY_WRITE access to the key passed in.

[Robert Shearman]

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  dlls/advapi32/cred.c |   17 ++++++++++++++---
  1 files changed, 14 insertions(+), 3 deletions(-)
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