added 12/24h timestamp formatting as birdnet.conf variable

defaults to 24h timestamps

working on species_notifier.sh

scripts/birdnet_recording.sh

@@ -2,15 +2,21 @@
 set -x
 source /etc/birdnet/birdnet.conf
 
+if [ "${TIMESTAMP_FORMAT}" == "12" ];then
+  STAMP="%I:%M:%S%P"
+else
+  STAMP="%H:%M:%S"
+fi
+
 if pgrep arecord &> /dev/null ;then
   echo "Recording"
 else
   if [ -z ${REC_CARD} ];then
     arecord -f S16_LE -c${CHANNELS} -r48000 -t wav --max-file-time 9\
-      --use-strftime ${RECS_DIR}/%B-%Y/%d-%A/%F-birdnet-%I:%M:%S%P.wav
+      --use-strftime ${RECS_DIR}/%B-%Y/%d-%A/%F-birdnet-${STAMP}.wav
   else
     arecord -f S16_LE -c${CHANNELS} -r48000 -t wav --max-file-time 9\
      -D "${REC_CARD}" --use-strftime \
-     ${RECS_DIR}/%B-%Y/%d-%A/%F-birdnet-%I:%M:%S%P.wav
+     ${RECS_DIR}/%B-%Y/%d-%A/%F-birdnet-${STAMP}.wav
   fi
 fi