misc: Replace "" with string.Empty.

src/Ryujinx.HLE/Loaders/Processes/Extensions/FileSystemExtensions.cs

@@ -89,7 +89,7 @@ namespace Ryujinx.HLE.Loaders.Processes.Extensions
                 Logger.Warning?.Print(LogClass.Ptc, "Detected unsupported ExeFs modifications. PTC disabled.");
             }
 
-            string programName = "";
+            string programName = string.Empty;
 
             if (!isHomebrew && programId > 0x010000000000FFFF)
             {

src/Ryujinx.HLE/Loaders/Processes/ProcessLoader.cs

@@ -145,7 +145,7 @@ namespace Ryujinx.HLE.Loaders.Processes
             IFileSystem dummyExeFs = null;
             Stream romfsStream = null;
 
-            string programName = "";
+            string programName = string.Empty;
             ulong programId = 0000000000000000;
 
             // Load executable.

src/Ryujinx.HLE/Loaders/Processes/ProcessLoaderHelper.cs

@@ -255,7 +255,7 @@ namespace Ryujinx.HLE.Loaders.Processes
             {
                 NsoExecutable nso => Convert.ToHexString(nso.BuildId.ItemsRo.ToArray()),
                 NroExecutable nro => Convert.ToHexString(nro.Header.BuildId),
-                _ => "",
+                _ => string.Empty
             }).ToUpper());
 
             ulong[] nsoBase = new ulong[executables.Length];