Fix unit tests in couch_mrview_compactor
Fix unit tests in couch_mrview_compactor

This fixes the two tests that are in couch_mrview_compactor.erl. For
some reason they don't always run in CI or even for local `make check`
runs. However when they do run they fail as they don't account for how
couch_index_updater:update/3 works and don't start couch_log.

The theory for why these don't always run is related to how meck loads
modules. I'm told that these should probably be moved to
test/couch_mrview_compactor_tests.erl but then that would remove access
to the recompact/1 function. For now I'll leave them here I guess and if
they do ever run they'll not break the build now.

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb