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

defaults to 24h timestamps

working on species_notifier.sh

scripts/install_services.sh

@@ -421,7 +421,7 @@ install_selected_services() {
     install_livestream_service
   fi
 
-  if [ ! -z "${INSTALL_NOMACHINE}" ];then
+  if [[ "${INSTALL_NOMACHINE}" =~ [Yy] ]];then
     install_nomachine
   fi