Fix worker_spi for new parameter to initialize connection

Missed in previous commit.

Spotted by Teodor and the buildfarm

src/test/modules/worker_spi/worker_spi.c

@@ -179,7 +179,7 @@ worker_spi_main(Datum main_arg)
 	BackgroundWorkerUnblockSignals();
 
 	/* Connect to our database */
-	BackgroundWorkerInitializeConnection("postgres", NULL);
+	BackgroundWorkerInitializeConnection("postgres", NULL, 0);
 
 	elog(LOG, "%s initialized with %s.%s",
 		 MyBgworkerEntry->bgw_name, table->schema, table->name);