Always start at the top of the directory in SetPathCase()

* When uefi-ntfs is being chainloaded, we can't guarantee that the file system
  will not have some directories already opened, in which case directory listing
  may continue from an existing location when invoking SetPathCase(), instead of
  starting from the beginning of that directory.
* Alleviate this by always issuing a SetPosition(0) when entering a directory.

path.c

@@ -142,6 +142,9 @@ EFI_STATUS SetPathCase(CONST EFI_FILE_HANDLE Root, CHAR16* Path)
 	if (EFI_ERROR(Status))
 		goto out;
 
+	// Make sure we always start at the top of the directory list
+	FileHandle->SetPosition(FileHandle, 0);
+
 	do {
 		Size = FileInfoSize;
 		ZeroMem(FileInfo, Size);