vfs_gpfs: Do not map DELETE sharemode access to WRITE

vfs_gpfs: Do not map DELETE sharemode access to WRITE

A SMB client can deny the WRITE sharemode, but still grant the DELETE
sharemode. Mapping the requested DELETE access to WRITE access breaks
this case. Fix this by removing the incorrect mapping from DELETE access
to WRITE access.

Signed-off-by: Christof Schmitt <cs@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>