Currently there is a redundant fill operation issued for every character
drawn. This was added to draw the background colours correctly but the
change did not account for the optimized character rendering in
_draw_glyph().
This results in ~15% performance improvement for character rendering
Fixes: cc34c5d46d ("draw565: Fix wrong background color of strings")
Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>
58b5c0378e