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

src/Ryujinx.HLE/HOS/Diagnostics/Demangler/Demangler.cs

@@ -2463,7 +2463,7 @@ namespace Ryujinx.HLE.HOS.Diagnostics.Demangler
                     return ParseIntegerLiteral("unsigned short");
                 case 'i':
                     _position++;
-                    return ParseIntegerLiteral("");
+                    return ParseIntegerLiteral(string.Empty);
                 case 'j':
                     _position++;
                     return ParseIntegerLiteral("u");

src/Ryujinx.HLE/HOS/ModLoader.cs

@@ -169,7 +169,7 @@ namespace Ryujinx.HLE.HOS
             foreach (var modDir in dir.EnumerateDirectories())
             {
                 types.Clear();
-                Mod<DirectoryInfo> mod = new("", null, true);
+                Mod<DirectoryInfo> mod = new(string.Empty, null, true);
 
                 if (StrEquals(RomfsDir, modDir.Name))
                 {

src/Ryujinx.UI.Common/Helper/FileAssociationHelper.cs

@@ -127,7 +127,7 @@ namespace Ryujinx.UI.Common.Helper
 
                     Logger.Debug?.Print(LogClass.Application, $"Adding type association {ext}");
                     using var openCmd = key.CreateSubKey(@"shell\open\command");
-                    openCmd.SetValue("", $"\"{Environment.ProcessPath}\" \"%1\"");
+                    openCmd.SetValue(string.Empty, $"\"{Environment.ProcessPath}\" \"%1\"");
                     Logger.Debug?.Print(LogClass.Application, $"Added type association {ext}");
 
                 }

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]),
             };