remove wakelock

was being used to keep ble active which is not what it does

in early testing the ble remains connected with display off and also
when switching apps

lib/services/background_service.dart

@@ -28,7 +28,6 @@ class BackgroundService {
       foregroundTaskOptions: const ForegroundTaskOptions(
         interval: 5000,
         autoRunOnBoot: false,
-        allowWakeLock: true,
         allowWifiLock: false,
       ),
     );