only make these changes once

scripts/update_birdnet2.sh

@@ -1,11 +1,13 @@
 #!/usr/bin/env bash
 # Second stage of update
+birdnet_conf=/home/pi/BirdNET-Pi/birdnet.conf
 
 # Stage 1 updates the birdnet.conf
-sudo -upi sed -i 's/EXTRACTIONS_URL/BIRDNETPI_URL/g' /home/pi/BirdNET-Pi/birdnet.conf
-echo "EXTRACTIONLOG_URL=" >> /home/pi/BirdNET-Pi/birdnet.conf
-echo "BIRDNETLOG_URL=" >> /home/pi/BirdNET-Pi/birdnet.conf
-
+sudo -upi sed -i 's/EXTRACTIONS_URL/BIRDNETPI_URL/g' 
+if ! grep EXTRACTIONLOG ${birdnet_conf} &> /dev/null;then
+  echo "EXTRACTIONLOG_URL=" >> ${birdnet_conf}
+  echo "BIRDNETLOG_URL=" >> ${birdnet_conf}
+fi
 # Stage 2 updates the services
 my_dir=${HOME}/BirdNET-Pi/scripts
 sudo ${my_dir}/update_services.sh