Rather than assuming a specific family exists, try a set of specific
names and if they fail, just grab any old font that the system reports
as existing

Closes
https://linear.app/zed-industries/issue/Z-445/thread-main-panicked-at-called-resultunwrap-on-an-err-value-could-not

Release Notes:

* Fixed crash that could happen if system did not have a specific
fallback font