Currently (for Ranked Choice only) a javascript exception is raised on very first vote, preventing the results from being rendered requiring a browser refresh (which doesn't error).
Resolves: TypeError: this.args.rankedChoiceOutcome.round_activity is undefined with simple addition of optional chaining operator.
* `@ember/owner` instead of `@ember/application`
* `discourse-i18n` instead of `I18n`
* `{ service } from "@ember/service"` instead of `inject as service`
