ncdu: update to 1.17 and add blue option

ncdu: update to 1.17 and add blue option

Upstream bump and add a patch to use a blue highlight color for the dark
color scheme (--color dark) as some users find the default bright green is
too intense.

Note that invoking ncdu without the --color switch at use uses the upstream
default bright green, so users will need to call ncdu with --color dark in
order to get the blue color.

Signed-off-by: John Audia <therealgraysky@proton.me>