bundle2: fix broken compression engine assertion
bundletype() is a function, so it needs to be called, and it is
documented to return a 2-tuple. This code is untested, so that's why
we haven't noticed the bad assertion.
Differential Revision: https://phab.mercurial-scm.org/D5155
running: init test1
result: 0
running: add foo
result: 0
running: commit -m commit1 -d 2000-01-01 foo
result: 0
running: commit -m commit2 -d 2000-01-02 foo
result: 0
running: log -r 0
changeset: 0:0e4634943879
user: test
date: Sat Jan 01 00:00:00 2000 +0000
summary: commit1
result: 0
running: log -r tip
changeset: 1:45589e459b2e
tag: tip
user: test
date: Sun Jan 02 00:00:00 2000 +0000
summary: commit2
result: 0