correctly name bluetooth device model (#179)

Author: Feichtmeier

lib/view/pages/bluetooth/BluetoothDeviceModel.dart renamed to lib/view/pages/bluetooth/bluetooth_device_model.dart

@@ -12,6 +12,7 @@ class BluetoothDeviceModel extends SafeChangeNotifier {
   late String address;
   late bool paired;
   late String errorMessage;
+  late bool connecting;
 
   BluetoothDeviceModel(this._device) {
     connected = _device.connected;

lib/view/pages/bluetooth/bluetooth_device_row.dart

@@ -2,7 +2,7 @@ import 'package:bluez/bluez.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
-import 'package:settings/view/pages/bluetooth/BluetoothDeviceModel.dart';
+import 'package:settings/view/pages/bluetooth/bluetooth_device_model.dart';
 import 'package:settings/view/pages/bluetooth/bluetooth_device_types.dart';
 import 'package:yaru_widgets/yaru_widgets.dart';