daemon: fix -R to enable supervision mode

If we're doing restarts, then we must supervise -- the 'R' case simply
got missed.

PR:	278342
Fixes:	f907027b49 ("daemon: set supervise_enabled during [..]")

usr.sbin/daemon/daemon.c

@@ -248,6 +248,7 @@ main(int argc, char *argv[])
 			if (e != NULL) {
 				errx(6, "invalid restart delay: %s", e);
 			}
+			state.mode = MODE_SUPERVISE;
 			break;
 		case 's':
 			state.syslog_priority = get_log_mapping(optarg,