UI: Only show Amiibo bin scan menu item if the key file exists

src/Ryujinx.HLE/HOS/Services/Nfc/AmiiboDecryption/AmiiboBinReader.cs

@@ -333,10 +333,9 @@ namespace Ryujinx.HLE.HOS.Services.Nfc.AmiiboDecryption
             return Path.Combine(AppDataManager.KeysDirPath, "key_retail.bin");
         }
 
-        public static bool HasKeyRetailBinPath()
-        {
-            return File.Exists(GetKeyRetailBinPath());
-        }
+        public static bool HasKeyRetailBinPath => File.Exists(GetKeyRetailBinPath());
+
+        
         public static DateTime DateTimeFromTag(ushort value)
         {
             try

src/Ryujinx/UI/ViewModels/MainWindowViewModel.cs

@@ -307,6 +307,9 @@ namespace Ryujinx.Ava.UI.ViewModels
                 OnPropertyChanged();
             }
         }
+
+        public bool CanScanAmiiboBinaries => AmiiboBinReader.HasKeyRetailBinPath;
+        
         public bool ShowLoadProgress
         {
             get => _showLoadProgress;

src/Ryujinx/UI/Views/Main/MainMenuBarView.axaml

@@ -176,6 +176,7 @@
                     AttachedToVisualTree="ScanBinAmiiboMenuItem_AttachedToVisualTree"
                     Click="OpenBinFile"
                     Header="{locale:Locale MenuBarActionsScanAmiiboBin}"
+                    IsVisible="{Binding CanScanAmiiboBinaries}"
                     IsEnabled="{Binding IsAmiiboBinRequested}" />
                 <MenuItem
                     Command="{Binding TakeScreenshot}"

src/Ryujinx/UI/Views/Main/MainMenuBarView.axaml.cs

@@ -203,7 +203,7 @@ namespace Ryujinx.Ava.UI.Views.Main
         private void ScanBinAmiiboMenuItem_AttachedToVisualTree(object sender, VisualTreeAttachmentEventArgs e)
         {
             if (sender is MenuItem)
-                ViewModel.IsAmiiboBinRequested = ViewModel.IsAmiiboRequested && AmiiboBinReader.HasKeyRetailBinPath();
+                ViewModel.IsAmiiboBinRequested = ViewModel.IsAmiiboRequested && AmiiboBinReader.HasKeyRetailBinPath;
         }
 
         private async void InstallFileTypes_Click(object sender, RoutedEventArgs e)