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

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

@@ -75,7 +75,7 @@ namespace Ryujinx.Ava.UI.Windows
                     string parentPath = currentCheatFile.Replace(titleModsPath, string.Empty);
 
                     buildId = Path.GetFileNameWithoutExtension(currentCheatFile).ToUpper();
-                    currentGroup = new CheatNode("", buildId, parentPath, true);
+                    currentGroup = new CheatNode(string.Empty, buildId, parentPath, true);
 
                     LoadedCheats.Add(currentGroup);
                 }

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]),
             };