misc: chore: replace some new "" additions & some I missed

src/Ryujinx/UI/Windows/XCITrimmerWindow.axaml.cs

@@ -32,9 +32,9 @@ namespace Ryujinx.Ava.UI.Windows
         {
             ContentDialog contentDialog = new()
             {
-                PrimaryButtonText = "",
-                SecondaryButtonText = "",
-                CloseButtonText = "",
+                PrimaryButtonText = string.Empty,
+                SecondaryButtonText = string.Empty,
+                CloseButtonText = string.Empty,
                 Content = new XCITrimmerWindow(mainWindowViewModel),
                 Title = string.Format(LocaleManager.Instance[LocaleKeys.XCITrimmerWindowTitle]),
             };