Implement AcquireNpadStyleSetUpdate event (#306)

* implement get npad set event

* move npad style set event to hid service

* fix spacing

* change event to field

* dispose event

Ryujinx.HLE/OsHle/Horizon.cs

@@ -233,4 +233,4 @@ namespace Ryujinx.HLE.OsHle
             }
         }
     }
-}
+}