tools/plugins.py: Remove redundant 'names' variable

Change-Id: I79f16a4d040893c35b93c31b9520cde102c79080
diff --git a/tools/plugins.py b/tools/plugins.py
index 501404b..1e07746 100644
--- a/tools/plugins.py
+++ b/tools/plugins.py
@@ -324,7 +324,6 @@
         return parent, owner_group_ids
 
     def _get_owner_names(self, parent, name, owner_group_ids):
-        names = set()
         accounts = set()
         external_groups = set()
         all_owner_group_ids = set(owner_group_ids)
@@ -357,8 +356,7 @@
                 print(
                     f"Failed to read owner group {id} of plugin {name}", file=sys.stderr
                 )
-        names = sorted({a.name for a in accounts} | external_groups)
-        csv = ", ".join(names)
+        csv = ", ".join(sorted({a.name for a in accounts} | external_groups))
         return accounts, csv
 
     def _is_project_empty(self, pluginName):