Allow cached freq and mode to be used when rig is in transceive mode

https://github.com/Hamlib/Hamlib/issues/1108

src/event.c

@@ -597,6 +597,7 @@ int rig_fire_freq_event(RIG *rig, vfo_t vfo, freq_t freq)
               (int64_t)freq, rig_strvfo(vfo));
 
     rig_set_cache_freq(rig, vfo, freq);
+    rig->state.use_cached_freq = 1;
 
     network_publish_rig_transceive_data(rig);
 
@@ -617,6 +618,7 @@ int rig_fire_mode_event(RIG *rig, vfo_t vfo, rmode_t mode, pbwidth_t width)
               rig_strrmode(mode), width, rig_strvfo(vfo));
 
     rig_set_cache_mode(rig, vfo, mode, width);
+    rig->state.use_cached_mode = 1;
 
     network_publish_rig_transceive_data(rig);