Convert the value from 'int' to 'CHAR16' to match the type of variable in ShellProtocol.c.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Shumin Qiu <shumin.qiu@intel.com>
Reviewed-by: Jaben Carsey <Jaben.carsey@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15271 6f19259b-4bc3-4df7-8a09-765794883524