[MOUNTMGR] Misc fixes for IOCTLs

git-svn-id: svn://svn.reactos.org/reactos/trunk/reactos@64448 97493ccd-5924-5043-b1f5-66cb403b36ce
[IMAADP32.ACM]
* Delete this duplicate.

git-svn-id: svn://svn.reactos.org/reactos/trunk/reactos@64451 97493ccd-5924-5043-b1f5-66cb403b36ce