default font colour in features of categories doesn't "stick"

[sgsinclair]

• open https://voyant-tools.org/?corpus=austen
• open options from Cirrus
• add category "titles"
• slide mr, mrs, miss into titles category
• click features

• 000000 is default but isn't used unless there's a change

[ajmacdonald]

f3b3f92ba89cf509f35767cbb9a87a7a61b386cb