Should Firefox shim be deleted?

[letavocado]

Mentioned in comment date is expired

// Firefox shim until 2023.04.11

wavesurfer.js/src/renderer.ts

Lines 278 to 279 in c8ff5a3

	// Firefox shim until 2023.04.11
	if (!ctx.roundRect) ctx.roundRect = ctx.fillRect

[katspaugh]

Yeah, I've already removed it on a branch I'm working on.