trees: handle all projects if project undefined

e.g. ./update trees -f

if passed, this command would download every tree

similarly, the -c option can be used in this way. this
solves a longstanding issue: on the current, much more
efficient design, it was not possible to systematically
clean every project.

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

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