In icom.c init() set priv->filter to RIG_PASSBAND_NOCHANGE to fix set_mode rigs with 2-byte cmds

https://github.com/Hamlib/Hamlib/issues/490

rigs/icom/icom.c

@@ -655,6 +655,7 @@ icom_init(RIG *rig)
     priv->tx_vfo = RIG_VFO_NONE;
     priv->rx_vfo = RIG_VFO_NONE;
     rig->state.current_vfo = RIG_VFO_NONE;
+    priv->filter = RIG_PASSBAND_NOCHANGE;
 
     rig_debug(RIG_DEBUG_TRACE, "%s: done\n", __func__);
 

rigs/icom/icom.h

@@ -30,7 +30,7 @@
 #include <sys/time.h>
 #endif
 
-#define BACKEND_VER "20201219"
+#define BACKEND_VER "20210106"
 
 /*
  * defines used by comp_cal_str in rig.c