Correct email name on onion only images

src/freedombone-base-email

 
     if [[ $ONION_ONLY != 'no' ]]; then
         my_email=$onion_address
-        MY_EMAIL_ADDRESS=$onion_address
+        MY_EMAIL_ADDRESS="${MY_USERNAME}@$onion_address"
         write_config_param "MY_EMAIL_ADDRESS" "$MY_EMAIL_ADDRESS"
     fi
 }