worker/uniter/remotestate: fix Actions test
worker/uniter/remotestate: fix Actions test

The TestActionsReceived test is starting a second watcher
without stopping the first one. This leads to intermittent
failures due to the events sometimes being consumed by
the wrong watcher. There's no need to start a second watcher
anyway, so I've simplified it to match the other tests.

voidspace/juju,perrito666/juju,wwitzel3/juju,wwitzel3/juju,ericsnowcurrently/juju,frankban/juju,davecheney/juju,ericsnowcurrently/juju,waigani/juju,bogdanteleaga/juju,bz2/juju,reedobrien/juju,mikemccracken/juju,mikemccracken/juju,bz2/juju,reedobrien/juju,bz2/juju,voidspace/juju,davecheney/juju,wwitzel3/juju,ericsnowcurrently/juju,marcmolla/juju,cloud-green/juju,mjs/juju,kat-co/juju,frankban/juju,mikemccracken/juju,gabriel-samfira/juju,mikemccracken/juju,anastasiamac/juju,marcmolla/juju,alesstimec/juju,bz2/juju,bac/juju,perrito666/juju,frankban/juju,howbazaar/juju,macgreagoir/juju,alesstimec/juju,anastasiamac/juju,waigani/juju,waigani/juju,tsakas/juju,bac/juju,dooferlad/juju,AdamIsrael/juju,fwereade/juju,marcmolla/juju,perrito666/juju,voidspace/juju,howbazaar/juju,mikemccracken/juju,mjs/juju,cloud-green/juju,macgreagoir/juju,makyo/juju,axw/juju,dooferlad/juju,AdamIsrael/juju,alesstimec/juju,tsakas/juju,axw/juju,gabriel-samfira/juju,dimitern/juju,kat-co/juju,makyo/juju,bz2/juju,fwereade/juju,ericsnowcurrently/juju,perrito666/juju,reedobrien/juju,fwereade/juju,axw/juju,bogdanteleaga/juju,gabriel-samfira/juju,cloud-green/juju,mjs/juju,alesstimec/juju,dimitern/juju,alesstimec/juju,mjs/juju,macgreagoir/juju,dimitern/juju,macgreagoir/juju,dimitern/juju,kat-co/juju,dooferlad/juju,anastasiamac/juju,bac/juju,axw/juju,bac/juju,anastasiamac/juju,mjs/juju,axw/juju,macgreagoir/juju,AdamIsrael/juju,frankban/juju,dooferlad/juju,howbazaar/juju,dimitern/juju,tsakas/juju,reedobrien/juju,mjs/juju,ericsnowcurrently/juju,cloud-green/juju,voidspace/juju,bac/juju,dooferlad/juju,reedobrien/juju,tsakas/juju,davecheney/juju,waigani/juju,marcmolla/juju,kat-co/juju,AdamIsrael/juju,anastasiamac/juju,bogdanteleaga/juju,bogdanteleaga/juju,gabriel-samfira/juju,wwitzel3/juju,makyo/juju,davecheney/juju,makyo/juju,frankban/juju,howbazaar/juju,kat-co/juju,gabriel-samfira/juju,mjs/juju,fwereade/juju,howbazaar/juju,marcmolla/juju,perrito666/juju