Revert "Fix typo which prevented metadata from going to cron job."

This reverts commit 876acb0.

Will send separate PR.

Signed-off-by: Spencer Schrock <sschrock@google.com>

cron/internal/worker/main.go

@@ -147,7 +147,7 @@ func processRequest(ctx context.Context,
 			logger.Info(fmt.Sprintf("invalid GitHub URL: %v", err))
 			continue
 		}
-		repo.AppendMetadata(repoReq.Metadata...)
+		repo.AppendMetadata(repo.Metadata()...)
 
 		commitSHA := clients.HeadSHA
 		requiredRequestType := []checker.RequestType{}