Fix font names in theme.txt file to match actual font names

[htoigo]

The names specified in the Hack font files in the theme are of the form Hack Regular size, and not Hack size, but the theme.txt file specifies fonts for various elements using the form Hack size. Note: the actual names of the fonts can be verified by viewing the Hack-*.pf2 files with a hex editor and looking at the NAME field.

Consequently, GRUB cannot find the fonts and substitutes other ones, which on my system are huge, so big, in fact, that most menu entries cannot fit on the screen, and making the theme very ugly.

This patch corrects the font names in the theme.txt file to match their names as given in the *.pf2 files, so GRUB is able to find the correct fonts, and the theme displays properly.

[adrium]

Works for me, great!