hle: Fix some inconsistencies in namespace naming in Services (#808)

Also fix IShopServiceAccessSystemInterface being in the wrong namespace.

Ryujinx.HLE/HOS/Services/Loader/IShellInterface.cs

@@ -0,0 +1,8 @@
+namespace Ryujinx.HLE.HOS.Services.Loader
+{
+    [Service("ldr:shel")]
+    class IShellInterface : IpcService
+    {
+        public IShellInterface(ServiceCtx context) { }
+    }
+}