Update parameter names of goScrollCB.
Update parameter names of goScrollCB.

The scroll callback handles x and y offsets, not positions.

azul3d/native-glfw,jonbuckley33/glfw3,go-gl/glfw,james4k/glfw,gonutz/glfw,jonbuckley33/glfw3,go-gl/glfw,go-gl/glfw,azul3d/native-glfw,gonutz/glfw,james4k/glfw