Fix DIRAUTH_SKIP_CHECKS constants

Good catch from starlight on ticket #32842 that these require a comma so the
constants are tuples rather than strings.

consensus_health_checker.py

@@ -28,7 +28,7 @@ Runlevel = stem.util.enum.UppercaseEnum('NOTICE', 'WARNING', 'ERROR')
 DIRECTORY_AUTHORITIES = stem.directory.Authority.from_cache()
 
 DIRAUTH_SKIP_CHECKS = (
-  'tor26'   # tor26 DirPort does not service requests without a .z suffix
+  'tor26',   # tor26 DirPort does not service requests without a .z suffix
 )
 
 EMAIL_SUBJECT = 'Consensus issues'

descriptor_checker.py

@@ -30,7 +30,7 @@ error: %s
 """
 
 DIRAUTH_SKIP_CHECKS = (
-  'tor26'   # tor26 DirPort does not service requests without a .z suffix
+  'tor26',   # tor26 DirPort does not service requests without a .z suffix
 )
 
 log = util.get_logger('descriptor_checker')