Remove ArrayMesh::surface_remove declaration

Removal was omitted in 449df8f688080c02bfbbfafc45421875b77deb1b

scene/resources/mesh.h

@@ -209,7 +209,6 @@ public:
 	void surface_update_region(int p_surface, int p_offset, const Vector<uint8_t> &p_data);
 
 	int get_surface_count() const override;
-	void surface_remove(int p_idx);
 
 	void clear_surfaces();