fix(is-icon-ligature): prevent canvas2d warning willReadFrequently

[Rrroman]

Removes the console warning related to font-icon checking and improves the speed of multiple readback operations, as mentioned in the warning.

Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true. See: https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-will-read-frequently

Closes: 3900

[CLAassistant]

All committers have signed the CLA.

[straker]

Thanks for the pr! Approved for security