Bug 1286092 - Stop using old style l10n routes for nightly. r=aki

for L10n jobs should run per-push based on the corresponding builds

Differential Revision: https://phabricator.services.mozilla.com/D1399

taskcluster/taskgraph/transforms/task.py

@@ -1435,8 +1435,6 @@ def add_nightly_l10n_index_routes(config, task, force_locale=None):
         for tpl in V2_NIGHTLY_L10N_TEMPLATES:
             routes.append(tpl.format(locale=locale, **subs))
 
-    # Add locales at old route too
-    task = add_l10n_index_routes(config, task, force_locale=force_locale)
     return task