refactor atheme2json to sort channel modes

This makes invoking the script multiple times with the same input return
the same result, which may not be the case before because sets are
unordered and thus the channel modes can become reordered across
multiple invocations of the script.

distrib/atheme/atheme2json.py

@@ -67,7 +67,7 @@ def convert(infile):
                     modes.add(mode)
                 elif flag & mlock_off != 0 and mode in modes:
                     modes.remove(mode)
-            chdata['modes'] = ''.join(modes)
+            chdata['modes'] = ''.join(sorted(modes))
             chdata['limit'] = int(parts[7])
         elif category == 'MDC':
             # auxiliary data for a channel registration