Update OrbitControls.html

[freez10]

Fixed controls.mouseButtons def example

[Mugen87]

This change does not look correct, see:

three.js/examples/jsm/controls/OrbitControls.js

Line 91 in 87e441a

this.mouseButtons = { LEFT: MOUSE.ROTATE, MIDDLE: MOUSE.DOLLY, RIGHT: MOUSE.PAN };

[mrdoob]

I guess the confusion comes from here?

three.js/src/constants.js

Line 2 in 87e441a

export const MOUSE = { LEFT: 0, MIDDLE: 1, RIGHT: 2, ROTATE: 0, DOLLY: 1, PAN: 2 };

I don't remember adding these constants to MOUSE... 🤔

[mrdoob]

Here's the PR that added these: #16961