make skipped tests in proposal-competition.spec.ts work again

These tests are apparently failing a bit arbitrarily (perhaps there is a race condition somewhere), for example compare https://travis-ci.com/github/daostack/client/builds/148911092 with https://travis-ci.com/github/daostack/client/builds/154457673

this is blocking development progress, so they were commented out in https://github.com/daostack/client/pull/435

they should be made to work though!

Start with proposal-competition.spec.ts and the tests commented out in pull request #435. Compare the Travis CI builds linked in the issue to identify why the tests fail intermittently, then run the relevant test suite repeatedly. Done means the skipped tests are enabled and pass reliably.

Written by the indexing model from the issue text.