Do not scroll up when modal is opened (#8095)

app/javascript/mastodon/components/status_list.js

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

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

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

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

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

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

...javascript/mastodon/features/favourited_statuses/index.js

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

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

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

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

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

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

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

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

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

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

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

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