Fix bug in ortho() where using it without arguements, drawing failed in some cases, resolved.

[diyaayay]

Resolves #6621

Changes:
In src/webgl/p5.Camera.js :
if (far === undefined) far = Math.max(this._renderer.width, this._renderer.height)+800;

In test/unit/webgl/p5.Camera.js :
var expectedMatrix = new Float32Array([ 0.019999999552965164, 0, 0, 0, 0, -0.019999999552965164, 0, 0, 0, 0, -0.002222222276031971, 0, -0, -0, -1, 1 ]);

Screenshots of the change:

Before:

function setup() {
  createCanvas(400, 400, WEBGL);
  ortho();
}

function draw() {
  background(220);
  box(100);
}

function setup() {
  createCanvas(100, 100, WEBGL);
  ortho();
}

function draw() {
  background(220);
  box(50);
}

PR Checklist

• npm run lint passes
• Inline documentation is included / updated
• Unit tests are included / updated

[diyaayay]

Waiting for a review. Perhaps @davepagurek or anyone?
Thanks.

[davepagurek]

Thanks for implementing the fix and updating the test!