[css-fonts] CBDT missing from color formats

[RoelN]

https://www.w3.org/TR/css-fonts-4/#font-face-src-parsing

<color-font-technology> = [COLR | SVG | sbix]

Should be something like

<color-font-technology> = [COLR | SVG | sbix | CBDT]

to include the CBDT/CBLC format.