pre_build.py: remove CONFIG_BT_ENABLED from sdkconfig patching (fixes BT pre-init conflict with USB)

src/main.cpp

@@ -346,10 +346,9 @@ void setup() {
     switch_driver.set_mux(&mux);
     switch_driver.begin();
     
-    // BLE disabled for crash diagnosis
-    // Serial.println("[INIT] Initializing BLE MIDI...");
-    // delay(1000);
-    // ble_midi_transport.begin();
+    Serial.println("[INIT] Initializing BLE MIDI...");
+    delay(1000);
+    ble_midi_transport.begin();
 
     Serial.println("[INIT] Initializing USB MIDI...");
     midi_transport.begin();