t6002: minor spelling fix.
t6002: minor spelling fix.

The test expects --bisect option can be configured with by setting
$_bisect_option.  So let's allow that uniformly.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git