Fix controller paging regression in creative menu

Preserve smooth row-by-row scrolling for mouse wheel input, but restore
full-page movement for controller/menu scroll actions in the creative
inventory.

Commit 3093ca3 changed page indexing to support smooth scrolling, which
caused ACTION_MENU_OTHER_STICK_UP/DOWN to advance by one row instead of
one page. Track whether the scroll action originated from the mouse
wheel and only use single-row steps in that case.

Fixes #253

Minecraft.Client/Windows64/KeyboardMouseInput.h

@@ -59,7 +59,8 @@ public:
 
 	int GetMouseWheel();
 	int PeekMouseWheel() const { return m_mouseWheelAccum; }
-	void ConsumeMouseWheel() { m_mouseWheelAccum = 0; }
+	void ConsumeMouseWheel() { if (m_mouseWheelAccum != 0) m_mouseWheelConsumed = true; m_mouseWheelAccum = 0; }
+	bool WasMouseWheelConsumed() const { return m_mouseWheelConsumed; }
 
 	// Per-frame delta consumption for low-latency mouse look.
 	// Reads and clears the raw accumulators (not the per-tick snapshot).
@@ -114,6 +115,7 @@ private:
 	int m_mouseDeltaAccumY;
 
 	int m_mouseWheelAccum;
+	bool m_mouseWheelConsumed;
 
 	bool m_mouseGrabbed;