mouse offscreen behaviors bugfix

[ksen0]

Addresses #8022
Build used by https://editor.p5js.org/ksen0/sketches/jX3A7w1dL
Snipped:

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

function draw() {
  background(220);
  text(movedX, 20, 20);
  text(movedY, 20, 40);
  text(mouseX, 50, 20);
  text(mouseY, 50, 40);
  circle(mouseX, mouseY, 50);
}
function mouseClicked() {
  requestPointerLock();
}