Partial revert, decouple TitleIDs.CurrentApplication from shader cache stuff; as I want that to ALWAYS reflect the current app.

src/Ryujinx.Graphics.Gpu/GraphicsConfig.cs

@@ -46,6 +46,12 @@ namespace Ryujinx.Graphics.Gpu
         /// Enables or disables high-level emulation of common GPU Macro code.
         /// </summary>
         public static bool EnableMacroHLE = true;
+        
+        /// <summary>
+        /// Title id of the current running game.
+        /// Used by the shader cache.
+        /// </summary>
+        public static string TitleId;
 
         /// <summary>
         /// Enables or disables the shader cache.