Change default maxCanvasWidth/Height to -1 (no max)

[mrxz]

Description:
As mentioned in #5413 the current default max width/height of 1920 is counter-intuitive. Most users are likely unaware of this default limit and they (or their users) will likely run into it once they notices a blurry and/or pixelated output on high resolution or oddly dimensioned displays. Especially with >1920x1080 resolutions becoming commonplace the limit is better removed IMO.

This PR only changes the default, the mechanism for limiting the resolution is still in place. Ultimately the logic might be removed entirely, but in its place we should probably expose the renderer's pixelRatio option to allow users to reduce the render resolution.

Changes proposed:

• Change the default maxCanvasWidth/Height to -1

[dmarcos]

Thanks!