Add Input::get_current_cursor_shape

[Clean up] Removed unused/unnecessary methods.

(cherry picked from commit 1bae73d7d060eeb9531fc5ba46de5d31dc7073c7)

os_haiku.cpp

@@ -203,6 +203,10 @@ void OS_Haiku::set_cursor_shape(CursorShape p_shape) {
 	//ERR_PRINT("set_cursor_shape() NOT IMPLEMENTED");
 }
 
+OS::CursorShape OS_Haiku::get_cursor_shape() const {
+	// TODO: implement get_cursor_shape
+}
+
 void OS_Haiku::set_custom_mouse_cursor(const RES &p_cursor, CursorShape p_shape, const Vector2 &p_hotspot) {
 	// TODO
 }

os_haiku.h

@@ -86,6 +86,7 @@ public:
 	virtual Point2 get_mouse_position() const;
 	virtual int get_mouse_button_state() const;
 	virtual void set_cursor_shape(CursorShape p_shape);
+	virtual CursorShape get_cursor_shape() const;
 	virtual void set_custom_mouse_cursor(const RES &p_cursor, CursorShape p_shape, const Vector2 &p_hotspot);
 
 	virtual int get_screen_count() const;