Revert "Change 3D slider in-game"

This reverts commit bb9a972e35.

Needs to be completely redone in the HID HLE service module.

src/core/hle/kernel/shared_page.cpp

@@ -121,10 +121,6 @@ void Handler::Set3DLed(u8 state) {
     shared_page.ledstate_3d = state;
 }
 
-void Handler::Set3DSlider(float slidestate) {
-    shared_page.sliderstate_3d = slidestate;
-}
-
 SharedPageDef& Handler::GetSharedPage() {
     return shared_page;
 }

src/core/hle/kernel/shared_page.h

@@ -91,8 +91,6 @@ public:
 
     void Set3DLed(u8);
 
-    void Set3DSlider(float);
-
     SharedPageDef& GetSharedPage();
 
 private: