buildhistory-diff: honour report_all flag
Make sure that we're passing a bool value. Without this, buildhistory
shows all the output for all the keys/fields when it shouldn't be by
default.
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>