this fixes an issue where when you lose R/C input on IOMCU that you
may not regain it when R/C comes back.
The issue stems from us still processing the DSM uart when we are
using the SD3 "SBUS" uart for RC input, and still doing the switch of
the SD3 config every 2 seconds.
When we are not searching for a new protocol we should not be changing
UART config
when we are looking for FPort input, we normally switch UART3 on the
IOMCU to 115200 to look for inverted inputs at 115200 baudrate. We
need to disable this switching when we have SBUS output enabled to
prevent a change in the SBUS output baudrate
Many thanks to afishman for finding this bug
Fixes#15522