cloudapi: make assignment more idiomatic

Actually, my IDE is shouting at me that so changing this to make it happy.

Signed-off-by: Ondřej Budai <ondrej@budai.cz>

internal/cloudapi/v2/server.go

@@ -211,7 +211,7 @@ func generateManifest(ctx context.Context, cancel context.CancelFunc, workers *w
 		break
 	}
 
-	var jobResult *worker.ManifestJobByIDResult = &worker.ManifestJobByIDResult{
+	jobResult := &worker.ManifestJobByIDResult{
 		Manifest: nil,
 	}