debian: fix accidental editing error in libext2fs2t664.symbols

Signed-off-by: Theodore Ts'o <tytso@mit.edu>

Author: tytso

debian/libext2fs2t64.symbols

@@ -414,7 +414,7 @@ libext2fs.so.2 libext2fs2t64 #MINVER#
  ext2fs_is_fast_symlink@Base 1.44.0~rc1
  ext2fs_journal_sb_start@Base 1.42.12
  ext2fs_link@Base 1.37
- Ext2fs_list_backups@Base 1.47.1~rc1
+ ext2fs_list_backups@Base 1.47.1~rc1
  ext2fs_llseek@Base 1.37
  ext2fs_lookup@Base 1.37
  ext2fs_make_generic_bitmap@Base 1.41.0