Add user preference to always expand toots marked with content warnings (#8762)

app/javascript/mastodon/initial_state.js

@@ -6,6 +6,7 @@ const getMeta = (prop) => initialState && initialState.meta && initialState.meta
 export const reduceMotion = getMeta('reduce_motion');
 export const autoPlayGif = getMeta('auto_play_gif');
 export const displaySensitiveMedia = getMeta('display_sensitive_media');
+export const expandSpoilers = getMeta('expand_spoilers');
 export const unfollowModal = getMeta('unfollow_modal');
 export const boostModal = getMeta('boost_modal');
 export const deleteModal = getMeta('delete_modal');