Don't disable blink when 'wantblink=true' in a section.

Previously, if a blink or high-blink font was specified in a font section
it was assumed that you did not want the terminal to actually blink the glyphs
displayed with that/those fonts. In some cases, blink may be preferable, so
if wantblink=true, then leave blink enabled on the terminal for blink/
high-blink fonts.