Also publish backup public key to avoid sync error messages

This shouldn't introduce any security issues

src/freedombone-controlpanel-user

 
 MY_EMAIL_ADDRESS=$USER@$HOSTNAME
 GPG_ID=$(gpg --fingerprint $MY_EMAIL_ADDRESS | grep -i "pub" | head -n 1 | awk -F '/' '{print $2}' | awk -F ' ' '{print $1}')
+GPG_BACKUP_ID=$(gpg --fingerprint "$MY_EMAIL_ADDRESS (backup key)" | grep -i "pub" | head -n 1 | awk -F '/' '{print $2}' | awk -F ' ' '{print $1}')
 
 UTILS_FILES=/usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-*
 for f in $UTILS_FILES
 
 function publish_gpg_key {
     gpg --send-key $GPG_ID
+    if [ $GPG_BACKUP_ID ]; then
+        gpg --send-key $GPG_BACKUP_ID
+    fi
     dialog --title $"Publish your PGP/GPG key" \
            --msgbox $"Your key has now been published" 6 40
 }