Update InstallOptions_Package.xaml.cs

Author: marticliment

src/UniGetUI/Pages/DialogPages/InstallOptions_Package.xaml.cs

@@ -44,7 +44,7 @@ public sealed partial class InstallOptionsPage : Page
 
         public InstallOptionsPage(IPackage package, InstallOptions options) : this(package, OperationType.None, options) { }
         public InstallOptionsPage(IPackage package, OperationType operation, InstallOptions options)
-        { 
+        {
             Package = package;
             InitializeComponent();
             Operation = operation;
@@ -267,10 +267,8 @@ private async Task LoadVersions()
             }
 
             VersionComboBox.IsEnabled =
-                (Operation == OperationType.Install
-                 || Operation == OperationType.None)
-                && (Package.Manager.Capabilities.SupportsCustomVersions
-                    || Package.Manager.Capabilities.SupportsPreRelease);
+                Operation is OperationType.Install or OperationType.None
+                && (Package.Manager.Capabilities.SupportsCustomVersions || Package.Manager.Capabilities.SupportsPreRelease);
             VersionProgress.Visibility = Visibility.Collapsed;
         }