Change vfo_fixup to default to VFO_A when not in split mode

Was staying on VFO_B when VFO_B was requested
https://github.com/Hamlib/Hamlib/issues/741

src/misc.c

@@ -1762,9 +1762,8 @@ vfo_t HAMLIB_API vfo_fixup(RIG *rig, vfo_t vfo)
 
         int satmode = rig->state.cache.satmode;
 
-        if (vfo == RIG_VFO_TX) { vfo = RIG_VFO_A; }
-
         if (split) { vfo = RIG_VFO_B; }
+        else { vfo = RIG_VFO_A; }
 
         if (VFO_HAS_MAIN_SUB_ONLY && !split && !satmode && vfo != RIG_VFO_B) { vfo = RIG_VFO_MAIN; }