Improve broadcast configuration for xmpp

src/freedombone-app-xmpp

@@ -843,8 +843,11 @@ function xmpp_onion_addresses {
 function xmpp_broadcast {
     filename="$1"
 
-    echo "Component \"notification@$HOSTNAME\" \"broadcast\"" >> "$filename"
-    echo "    broadcast_senders = { \"notification@$HOSTNAME\" }" >> "$filename"
+    if ! grep -q "broadcast_senders" "$filename"; then
+        echo "broadcast_senders = { \"notification@$HOSTNAME\" }" >> "$filename"
+    else
+        sed -i "s|broadcast_senders.*|broadcast_senders = { \"notification@$HOSTNAME\" }|g" "$filename"
+    fi
 }
 
 function xmpp_create_config {