refactor: Rewrite immutablejs import statements using destructuring (#4147)

app/javascript/mastodon/actions/notifications.js

app/javascript/mastodon/actions/store.js

app/javascript/mastodon/actions/timelines.js

app/javascript/mastodon/features/account_timeline/index.js

app/javascript/mastodon/features/notifications/index.js

.../features/report/containers/status_check_box_container.js

...cript/mastodon/features/ui/components/onboarding_modal.js

...avascript/mastodon/features/ui/components/report_modal.js

.../mastodon/features/ui/containers/status_list_container.js

app/javascript/mastodon/reducers/accounts.js

app/javascript/mastodon/reducers/accounts_counters.js

app/javascript/mastodon/reducers/alerts.js

app/javascript/mastodon/reducers/cards.js

app/javascript/mastodon/reducers/compose.js

app/javascript/mastodon/reducers/contexts.js

app/javascript/mastodon/reducers/media_attachments.js

app/javascript/mastodon/reducers/meta.js

app/javascript/mastodon/reducers/notifications.js

app/javascript/mastodon/reducers/relationships.js

app/javascript/mastodon/reducers/reports.js