load-utxo-set should check for pruning

contrib/FastSync/load-utxo-set.sh

@@ -28,6 +28,14 @@ if ! [[ "$NBITCOIN_NETWORK" ]]; then
     exit 1
 fi
 
+if ! [[ "$BTCPAYGEN_ADDITIONAL_FRAGMENTS" == *"opt-save-storage"* ]]; then
+  echo "Pruning must be enabled, please update BTCPAYGEN_ADDITIONAL_FRAGMENTS by running:"
+  echo ""
+  echo 'BTCPAYGEN_ADDITIONAL_FRAGMENTS="$BTCPAYGEN_ADDITIONAL_FRAGMENTS;opt-save-storage-s"'
+  echo '. btcpay-setup -i'
+  exit 1
+fi
+
 TAR_FILE="$1"
 
 if ! [[ "$UTXO_DOWNLOAD_LINK" ]]; then