fix(script): No need for echo

notify_signal_about_traccar_events.sh

@@ -83,8 +83,8 @@ function craft_message() {
 function send_to_signal() {
     local signal_message
     signal_message="${1}"
-    echo "${signal_message}"
     curl \
+        --silent \
         --request 'POST' \
         --header 'Content-Type: application/json' \
         --data '{"message":"'"${signal_message}"'","number":"'"${signal_sender_phone_number}"'","recipients":'"${signal_recipients_array}"'}' \