console: Fix wrong cast in coverage prefixes
console: Fix wrong cast in coverage prefixes

I'm not sure what I was thinking here, but env_coverage_prefixes is a
string, not a strv, and needs to be split up.

https://bugzilla.gnome.org/show_bug.cgi?id=772033

endlessm/gjs,endlessm/gjs,endlessm/gjs,endlessm/gjs,endlessm/gjs