bcachefs: Fix permissions on version modparam

There's no reason for this not to be world readable - it provides the
currently supported on disk format version.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Author: Kent Overstreet

fs/bcachefs/super.c

@@ -2259,7 +2259,7 @@ BCH_DEBUG_PARAMS()
 
 __maybe_unused
 static unsigned bch2_metadata_version = bcachefs_metadata_version_current;
-module_param_named(version, bch2_metadata_version, uint, 0400);
+module_param_named(version, bch2_metadata_version, uint, 0444);
 
 module_exit(bcachefs_exit);
 module_init(bcachefs_init);