fix incorrect s6wrap usage (#260)

rootfs/etc/s6-overlay/scripts/fr24feed_check_traffic

@@ -13,9 +13,9 @@ while true; do
   sleep "$WATCH_INTERVAL" &
 
   if ! pcap_log=$(timeout --preserve-status "$WATCH_INTERVAL" tcpdump -p tcp src port "${BEASTPORT:-30005}" 2>/dev/stdout 1>/dev/null); then
-    "${s6wrap}" echo "[WARNING] Cannot check data flow because tcpdump fails to execute. Try adding NET_ADMIN and NET_RAW capabilities to your container"
-    "${s6wrap}" tail <<< "$pcap_log"
-    packets_rcvd="-1"   
+    "${s6wrap[@]}" echo "[WARNING] Cannot check data flow because tcpdump fails to execute. Try adding NET_ADMIN and NET_RAW capabilities to your container"
+    "${s6wrap[@]}" tail <<< "$pcap_log"
+    packets_rcvd="-1"
   else
     packets_rcvd=$(sed -z 's/\n/; /g;s/; $//;s/^.*\s\([0-9]\+\) packets captured.*$/\1/g' <<< "$pcap_log")
   fi
@@ -24,8 +24,8 @@ while true; do
   tail -100 "${TRAFFIC_FILE}" > "${TRAFFIC_FILE}".1
   mv -f "${TRAFFIC_FILE}".1 "${TRAFFIC_FILE}"
   if chk_enabled "$VERBOSE_LOGGING" && [[ "$packets_rcvd" != "-1" ]]; then
-    s6wrap --quiet --timestamps --prepend="$(basename "$0")" --args echo "$packets_rcvd packets received from $BEASTHOST in the past 5 minutes"
-  fi 
+    "${s6wrap[@]}" echo "$packets_rcvd packets received from $BEASTHOST in the past 5 minutes"
+  fi
 
   wait
 done