bisect-kit: Add use_btrfs in function arguments

Refactor according to comments in https://crrev.com/c/3555293.

BUG=b:222638221
TEST=./setup_cros_bisect.py sync

Change-Id: Id09072ef4c7dac5d196e5ceb70d8089beb336f9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/bisect-kit/+/3557046
Reviewed-by: Kuang-che Wu <kcwu@chromium.org>
Commit-Queue: Zheng-Jie Chang <zjchang@chromium.org>
Tested-by: Zheng-Jie Chang <zjchang@chromium.org>
1 file changed