Fix rig_cache to fix up RIG_VFO_OTHER when requested.

https://github.com/Hamlib/Hamlib/issues/1086

src/cache.c

@@ -46,6 +46,7 @@ int rig_set_cache_mode(RIG *rig, vfo_t vfo, rmode_t mode, pbwidth_t width)
     if (vfo == RIG_VFO_NONE || vfo == RIG_VFO_CURR) { vfo = RIG_VFO_A; }
 
     if (vfo == RIG_VFO_SUB && rig->state.cache.satmode) { vfo = RIG_VFO_SUB_A; };
+    if (vfo == RIG_VFO_OTHER) vfo = vfo_fixup(rig, vfo, rig->state.cache.split);
 
     switch (vfo)
     {