revset: fix commonancestor test so it demonstrates correct behavior
The problem is that hg log -r 'head()' is every changeset in the
repository, because in this test repository, every changeset has a
different branch. The author probably assumed all commits were on the
default branch, and that they were getting topological heads, 7 and 9.
As a result, this test was showing that the common ancestors of
0:9 are 0+1+2+4, which is not correct (next commit will test this).
Differential Revision: https://phab.mercurial-scm.org/D4736
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