We need to do this before the preferences are loaded, or the system
default size is lost. Given that our other sizes are all relative to
this value, that would be a problem.
With this we can now ensure that we always have the right font size for
smaller, regular, and larger theme settings.
Also removes some obsolete commented out code.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>