obslog: remove now-unused code for plain styling
We now always use a non-plain formatter for the non-local-filtering
code paths, so we can remove the code for plain styling.
I couldn't figure out how to replace the fm.formatlist() by something
less about formatting, so I've only removed the irrelevant arguments
from those calls.
Test that share-clones use the cache in the original repository.
$ . $TESTDIR/testlib/common.sh
$ hg init share-base
$ cd share-base/
$ cat >> .hg/hgrc <<EOF
> [extensions]
> evolve=
> share=
> EOF
$ hg debugbuilddag .+3:branchpoint+4*branchpoint+2
$ cd ..
$ hg --config extensions.share= share -U share-base share-client
$ cd share-client
$ hg debugupdatecache
$ test -d .hg/cache
[1]
$ test -d ../share-base/.hg/cache