DB fonts are not used in tailwind-specific classes

If you use `@db-ui/base` with Tailwind CSS and you try to use `font-bold` the DB fonts will not be used.

Issue:
Tailwind will try to use the CSS `font-family: 'DB Screen Sans Bold', Helvetica, Arial, sans-serif` which contains the wrong font name `DB Screen Sans Bold`.

Solution:
Tailwind should use the font family `DB Screen Sans` instead of the wrong name `DB Screen Sans Bold`.