altosdroid: match only the current version tag

altosdroid: match only the current version tag

Don't match non version tags - and always return the long format of
git describe, rather than just the tag (when the tag is on the current
commit).

Split the commit number/hash more reliably by removing the version tag
from the result first.

Signed-off-by: Mike Beattie <mike@ethernal.org>