Add missing -g to the message in gravity recovery command

Signed-off-by: RD WebDesign <github@rdwebdesign.com.br>

gravity.sh

@@ -947,7 +947,7 @@ database_recovery() {
   else
     echo -e "${OVER}  ${CROSS} ${str} - the following errors happened:"
     while IFS= read -r line; do echo "  - $line"; done <<<"$result"
-    echo -e "  ${CROSS} Recovery failed. Try \"pihole -r recreate\" instead."
+    echo -e "  ${CROSS} Recovery failed. Try \"pihole -g -r recreate\" instead."
     exit 1
   fi
   echo ""