code_style: remove unnecessary whitespaces

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/App.Commands.cs

@@ -55,13 +55,13 @@ public static bool IsCheckForUpdateCommandVisible
             else if (!string.IsNullOrEmpty(textBlock.Text))
                 await CopyTextAsync(textBlock.Text);
         });
-        
+
         public static readonly Command HideAppCommand = new Command(_ =>
         {
             if (Current is App app && app.TryGetFeature(typeof(IActivatableLifetime)) is IActivatableLifetime lifetime)
                 lifetime.TryEnterBackground();
         });
-        
+
         public static readonly Command ShowAppCommand = new Command(_ =>
         {
             if (Current is App app && app.TryGetFeature(typeof(IActivatableLifetime)) is IActivatableLifetime lifetime)