yml reformatting

[DanielEWeeks]

webexercises looks wonderful and I'm looking forward to using it!

After I did add_to_quarto(), it broke my yml:

add_to_quarto()
webex.css, webex.js, and webexercises.qmd updated
./_quarto.yml updated

ERROR: Project _quarto.yml validation failed.

In file _quarto.yml
(line 40, columns 10--13) Field "filters" has value webr, which must instead be an array of values, where each element must be at least one of: a string, an object, an object
39: editor: visual
40: filters: webr

The fix is easy - I just had to change the filters section back to

filters:
   - webr