Use sorted() instead of list-set-sort() dance

bin/rezelist

@@ -32,8 +32,7 @@ def main():
 
     output = dict()
     for d in config["domains"]:
-        # set to make unique, list to make sortable
-        output[d] = list(
+        output[d] = sorted(
             {
                 a.localpart
                 for a in addresses
@@ -41,7 +40,6 @@ def main():
                 and a.localpart not in config["exclude"]
             }
         )
-        output[d].sort()
 
     for k, v in output.items():
         with open(config["output"].format(domain=k), "w") as f: