fix(mastodon): Fix error query in SLO

apps/k8s01/mastodon/slo.yaml

@@ -11,7 +11,7 @@ spec:
       description: "Mastodon: SLO based on failed jobs in sidekiq."
       sli:
         events:
-          errorQuery: (sum(rate(sidekiq_failed_jobs_total{namespace="mastodon"}[{{.window}}]))
+          errorQuery: sum(rate(sidekiq_failed_jobs_total{namespace="mastodon"}[{{.window}}]))
           totalQuery: sum(rate(sidekiq_processed_jobs_total{namespace="mastodon"}[{{.window}}]) + rate(sidekiq_failed_jobs_total{namespace="mastodon"}[{{.window}}]))
       alerting:
         name: MastodonSidekiqProccessingHighErrorRate