git.sh: fix error with cache re-download

in some cases, on a fresh clone, the cached repo already
exists but lbmk tries to download it again. work around
this by checking that the directory exists; it's in the
main if statement, so that the "else" still applies. as
a result, the fallback to a live repo would un-fall back
to doing git-pull if the cached directory exists exists.

if it doesn't seem to make sense, it's because it doesn't.
this whole function needs to be rewritten better.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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