Remove extra Success message at the end of initdb

This was accidentally included in e09155bd and is redundant with the
lines right above it.

Reported-By: Peter Eisentraut
Discussion: https://postgr.es/m/455845d1-441d-cc40-d2a7-b47f4e422489@2ndquadrant.com

src/bin/initdb/initdb.c

@@ -3249,8 +3249,6 @@ main(int argc, char *argv[])
 			   start_db_cmd->data);
 
 		destroyPQExpBuffer(start_db_cmd);
-
-		printf(_("\nSuccess.\n"));
 	}