Add FUNC_TONE tone_enable to icom_set_split_freq too

rigs/icom/icom.c

@@ -5566,6 +5566,10 @@ int icom_set_split_freq(RIG *rig, vfo_t vfo, freq_t tx_freq)
             RETURNFUNC2(retval);
         }
     }
+    if (priv->tone_enable)
+    {
+        rig_set_func(rig, RIG_VFO_CURR, RIG_FUNC_TONE, 1);
+    }
 
     RETURNFUNC2(retval);
 }