[FREELDR] Make the NTFS filename comparison conforming to NTLDR/BOOTMGR (#8021)

When an NTFS partition is created with Windows and modified with Linux
(see below), the NTLDR/BOOTMGR will compare the file names ignoring the
case of the files, while FreeLdr does not and the same hack is on Btrfs
file name comparison.

This PR is necessary because the case of the file names on registry, etc.
may not always be consistent!

How to reproduce:
- Try to install Windows with NTFS and install FreeLdr on it;
- Try to modify Windows partition on Linux like creating/copying some new files;
- Try to boot with FreeLdr (it will fail if the hive file path case is different
than the actual file path);
- Try to boot with NTLDR/BOOTMGR (it will work finally reaching the desktop).

boot/freeldr/freeldr/lib/fs/ntfs.c

···
     if (strlen(FileName) != EntryFileNameLength)
         return FALSE;
 
-    /* Do case-sensitive compares for Posix file names. */
-    if (IndexEntry->FileName.FileNameType == NTFS_FILE_NAME_POSIX)
-    {
-        for (i = 0; i < EntryFileNameLength; i++)
-            if (EntryFileName[i] != FileName[i])
-                return FALSE;
-    }
-    else
+    /*
+     * Always perform case-insensitive comparison for file names.
+     * This is necessary, because when modifying e.g. on Linux a Windows NTFS
+     * partition formatted with Windows itself, the NTLDR/BOOTMGR will boot
+     * normally ignoring the case of the paths.
+     */
+    for (i = 0; i < EntryFileNameLength; i++)
     {
-        for (i = 0; i < EntryFileNameLength; i++)
-            if (tolower(EntryFileName[i]) != tolower(FileName[i]))
-                return FALSE;
+        if (tolower(EntryFileName[i]) != tolower(FileName[i]))
+            return FALSE;
     }
 
     return TRUE;