Overo logging: Send the settings every thirty seconds

Since the FC doesn't know when logging starts and and the overo doesn't
log all settings when logging starts (and we shouldn't assume it will
because that would require the overo to always be synced with the UAVO
set), this just sends them all every thirty seconds.

This is waiting a more complete fix on the overo server side but I thought I'd just get this merged for now.