ShellPkg: stop taking EFI_HANDLE in place of SHELL_FILE_HANDLE

The TouchFileByHandle() and IsDirectoryEmpty() functions are passed
SHELL_FILE_HANDLE parameters, and they use those parameters correctly.
However, their parameter lists say EFI_HANDLE.

Spell out the right type in the parameter lists.

In practice, this change is a no-op (because, quite regrettably, both
EFI_HANDLE and SHELL_FILE_HANDLE are specified to be typedefs of (VOID*)).

Cc: Jaben Carsey <jaben.carsey@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Zhichao Gao <zhichao.gao@intel.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
Reviewed-by: Zhichao Gao <zhichao.gao@intel.com>

ShellPkg/Library/UefiShellLevel2CommandsLib/Rm.c

@@ -24,7 +24,7 @@ STATIC CONST SHELL_PARAM_ITEM ParamList[] = {
 **/
 BOOLEAN
 IsDirectoryEmpty (
-  IN EFI_HANDLE   FileHandle
+  IN SHELL_FILE_HANDLE   FileHandle
   )
 {
   EFI_STATUS      Status;

ShellPkg/Library/UefiShellLevel3CommandsLib/Touch.c

@@ -21,7 +21,7 @@
 **/
 EFI_STATUS
 TouchFileByHandle (
-  IN EFI_HANDLE Handle
+  IN SHELL_FILE_HANDLE Handle
   )
 {
   EFI_STATUS    Status;