Add debug info to k3_set_mode

https://github.com/Hamlib/Hamlib/issues/825

rigs/kenwood/k3.c

@@ -1096,7 +1096,7 @@ int k3_set_mode(RIG *rig, vfo_t vfo, rmode_t mode, pbwidth_t width)
     struct kenwood_priv_caps *caps = kenwood_caps(rig);
     struct kenwood_priv_data *priv = rig->state.priv;
 
-    rig_debug(RIG_DEBUG_VERBOSE, "%s called\n", __func__);
+    rig_debug(RIG_DEBUG_VERBOSE, "%s called vfo=%s mode=%s width=%d\n", __func__, rig_strvfo(vfo), rig_strrmode(mode), (int)width);
 
     if (vfo == RIG_VFO_CURR)
     {