draw565: Fix bounding box calculations

wasp-os uses an drawing optimization technique to automatically place
a single pixel line on the right of glyphs when rendering them. This
results in a change to the bounding box for a rendered string (by adding
a single pixel on the right of the final character). Fix the bounding box
calculations accordingly. Among other things this eliminates graphical
artifacts when rendering labels in 2048.

Fixes: #203
Fixes: 58b5c0378ec3 ("draw565: Optimize the string drawing")
Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>

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