Dropped internal LFS_i_UNTIDY pseudo-alias flag

We really shouldn't have two names for the same thing, it just makes
things more confusing, even if the public name doesn't quite match the
internal usage. Especially now that we internally rely on these being
the same flag.

This renames LFS_i_UNTIDY -> LFS_I_MKCONSISTENT and drops the untidy/
mktidy naming internally.

No code changes.

scripts/dbgflags.py

@@ -85,8 +85,6 @@ FLAGS = [
     ('M', 'CKMETA',    0x00100000, "Check metadata checksums"                 ),
     ('M', 'CKDATA',    0x00200000, "Check metadata + data checksums"          ),
 
-    ('m', 'UNTIDY',    0x00010000, "Filesystem may have orphaned stickynotes" ),
-
     # GC flags
     ('GC', 'MKCONSISTENT',
                        0x00010000, "Make the filesystem consistent"           ),