Change VFO/subreceiver priority for satellite operation

Icom IC-9100 has A and B VFOs for each subreceiver, MAIN and SUB.
For full-duplex satellite operation switching between VFOA and VFOB
on one of these receivers is not of interest; this is specifically
used in same-band split operation.

 - MAIN/SUB VFO now ahead of VFOA/VFOB.