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.
Status Job ID Name Coverage
  Test
passed #907812
flatpak
flatpak

01:10:04