Enable bluetooth after boot, not during boot

This avoids some bluetooth-related devices being delivered before
BootComplete

src/audio/audio_fsm.cpp

@@ -442,6 +442,8 @@ void Uninitialised::react(const system_fsm::BootComplete& ev) {
       drivers::NvsStorage::Output::kHeadphones) {
     sOutput = sI2SOutput;
   } else {
+    // Ensure Bluetooth gets enabled if it's the default sink.
+    sServices->bluetooth().Enable();
     sOutput = sBtOutput;
   }
   sOutput->mode(IAudioOutput::Modes::kOnPaused);

src/system_fsm/booting.cpp

@@ -109,12 +109,6 @@ auto Booting::entry() -> void {
       sServices->nvs(), sServices->bg_worker()));
   sServices->bluetooth().SetEventHandler(bt_event_cb);
 
-  if (sServices->nvs().OutputMode() ==
-      drivers::NvsStorage::Output::kBluetooth) {
-    ESP_LOGI(kTag, "enabling bluetooth");
-    sServices->bluetooth().Enable();
-  }
-
   BootComplete ev{.services = sServices};
   events::Audio().Dispatch(ev);
   events::Ui().Dispatch(ev);