changes to support wtfos full screen OSD on DJI

Configurator tips with changes to support DJI wtfos changes for full screen OSD
iNav 5.1 builds with wtfos support can be found here
https://github.com/jeffhendrix/inav/releases/tag/5.1_dji_wtf

After installing the new iNav, go to the ports tab and under Peripherals, select 'MSP Displayport' for the uart connected to the Air Unit.
Save and Reboot
Under the OSD tab, select DJIWTF and you will have the full 60x22 OSD to work with.