change variable

src/freedombone-controlpanel-user

 	case $sel in
 		0)
 			SIGN_ADDRESS=$(<$data)
-			if [ ${#IMAGE_URL} -gt 2 ]; then
+			if [ ${#SIGN_ADDRESS} -gt 2 ]; then
 				clear
 				fpr=$(gpg --with-colons --fingerprint "$SIGN_ADDRESS" | grep fpr | head -n 1 | awk -F ':' '{print $10}')
 				if [[ $fpr == *"error"* ]]; then