Pass correct flags to CommitImage and UnmountImage (#31)
Pass correct flags to CommitImage and UnmountImage (#31)

Corrects the DismApi.UnmountImage() function, where it incorrectly selects DISM_COMMIT_MASK instead of DISM_COMMIT_IMAGE as the flag when the caller intends to commit changes to a mounted image.

Fixes #24 
josemesona/ManagedDism,Shidell/ManagedDism,josemesona/ManagedDism