ShellPkg: fix typo.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Bobzin (jeff.bobzin@insyde.com) 
Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Erik Bjorge <erik.c.bjorge@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/ShellPkg@15696 6f19259b-4bc3-4df7-8a09-765794883524