Fix IC706 for 5 byte channels

https://github.com/Hamlib/Hamlib/issues/295

rigs/icom/icom.c

@@ -1119,7 +1119,7 @@ int icom_get_freq(RIG *rig, vfo_t vfo, freq_t *freq)
     cmd = C_RD_FREQ;
     subcmd = -1;
 
-    if (vfo == RIG_VFO_MEM && priv->civ_731_mode)
+    if (vfo == RIG_VFO_MEM && (priv->civ_731_mode || rig->caps->rig_model == RIG_MODEL_IC706))
     {
         rig_debug(RIG_DEBUG_TRACE, "%s: VFO=MEM so turning off civ_731\n", __func__);
         civ_731_mode = 1;

rigs/icom/icom.h

@@ -30,7 +30,7 @@
 #include <sys/time.h>
 #endif
 
-#define BACKEND_VER "20210217"
+#define BACKEND_VER "20210223"
 
 /*
  * defines used by comp_cal_str in rig.c