precheck: Improve bisect detectionHEADmaster

After a bisect session begins and up until the first 'bad' and 'good'
revisions are identified, BISECT_EXPECTED_REV is undefined, and the
freshly started session goes undetected by git-precheck.

Among a few potential alternatives, BISECT_START is a better signal, as
it covers this gap and exists for the entire duration of a session -
from 'git bisect start' to 'git bisect reset'.

The file-based detection paradigm makes this choice more obvious.

Signed-off-by: Matt Hunter <m@lfurio.us>

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