Fix the block font to load with current fontconfig

Fontconfig has started to be more picky about ttf
files. Arguably, that is a bug:
https://gitlab.freedesktop.org/fontconfig/fontconfig/-/issues/259

Until it is fixed, we can work around the problem
by giving the font some more metadata to convince
fontconfig to load it.
2 jobs for master in 55 minutes and 28 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #907813
flatpak
flatpak

00:53:09

 
  Deploy
passed #907814
nightly

00:02:18