Force Icom rigs to set VFOA as startup VFO

https://github.com/Hamlib/Hamlib/issues/665

src/rig.c

@@ -1014,6 +1014,7 @@ int HAMLIB_API rig_open(RIG *rig)
 
         if (backend_num == RIG_ICOM)
         {
+            rig_set_vfo(rig, RIG_VFO_A); // force VFOA as our startup VFO
             rig_debug(RIG_DEBUG_TRACE, "%s: Icom rig so default vfo = %s\n", __func__,
                       rig_strvfo(rs->current_vfo));
         }