chore: 多余默认值优化

Changed CurrentConfiguration property to be non-nullable.

src/MaaWpfGui/Helper/ConfigConverter.cs

@@ -60,8 +60,9 @@ public class ConfigConverter
         {
             ret &= ConvertTaskQueue();
         }
-        else if (configurations != null) // 保证 configurations 可用
+        else if (configurations != null)
         {
+            // 保证 configurations 可用
             if (parsedOld["Configurations"] is JObject oldConfigurations)
             {
                 // 删除多余配置

src/MaaWpfGui/Models/Copilot/CopilotModel.cs

@@ -117,6 +117,7 @@ public class CopilotModel : CopilotBase
             return string.Empty;
         }
         string[] moduleName = [string.Empty, "χ", "γ", "α", "Δ"];
+
         // var moduleLevel = req.ModuleLevel > 0 ? $" [Lv.{req.ModuleLevel}]" : string.Empty;
 
         // 模组编号 -1: 不切换模组 / 无要求, 0: 不使用模组, 1: 模组χ, 2: 模组γ, 3: 模组α, 4: 模组Δ

src/MaaWpfGui/ViewModels/UI/SettingsViewModel.cs

@@ -501,9 +501,9 @@ public class SettingsViewModel : Screen
 
     public ObservableCollection<CombinedData> ConfigurationList { get; set; } = [];
 
-    private string? _currentConfiguration = ConfigurationHelper.GetCurrentConfiguration();
+    private string _currentConfiguration = ConfigurationHelper.GetCurrentConfiguration();
 
-    public string? CurrentConfiguration
+    public string CurrentConfiguration
     {
         get => _currentConfiguration;
         set {

src/MaaWpfGui/ViewModels/UserControl/Settings/TimerSettingsUserControlModel.cs

@@ -143,16 +143,16 @@ public class TimerSettingsUserControlModel : PropertyChangedBase
                 }
             }
 
-            private string? _timerConfig;
+            private string _timerConfig;
 
             /// <summary>
             /// Gets or sets the config of the timer.
             /// </summary>
-            public string? TimerConfig
+            public string TimerConfig
             {
                 get => _timerConfig;
                 set {
-                    SetAndNotify(ref _timerConfig, value ?? ConfigurationHelper.GetCurrentConfiguration());
+                    SetAndNotify(ref _timerConfig, value);
                     ConfigurationHelper.SetTimerConfig(TimerId, _timerConfig);
                 }
             }