Break out nested relationship API keys (#5887)

* Break out nested relationship API keys

This closes #5856 by restoring the existing behavior of the `muting`
and `following` keys (returning booleans rather than truthy or false).
It adds `showing_reblogs` and `muting_notifications` keys:

* `showing_reblogs` returns true if:
  1. You've requested to follow the user, with reblogs shown, or
  2. You are following the user, with reblogs shown.
* `muting_notifications` returns true if you have muted the user and
  their notifications as well.

* Rubocop fix

* Fix pulling reblog/mute status from relationships

I could swear this had passed tests before, but apparently not.
Works now.

* More test fixes

Really, you'd expect this to be more straightforward.

1 files changed, 1 insertions, 1 deletions

diff --git a/app/javascript/mastodon/features/account_timeline/containers/header_container.js b/app/javascript/mastodon/features/account_timeline/containers/header_container.js
index b41eb19d4..775610032 100644
--- a/app/javascript/mastodon/features/account_timeline/containers/header_container.js
+++ b/app/javascript/mastodon/features/account_timeline/containers/header_container.js
@@ -68,7 +68,7 @@ const mapDispatchToProps = (dispatch, { intl }) => ({
   },
 
   onReblogToggle (account) {
-    if (account.getIn(['relationship', 'following', 'reblogs'])) {
+    if (account.getIn(['relationship', 'show_reblogs'])) {
       dispatch(followAccount(account.get('id'), false));
     } else {
       dispatch(followAccount(account.get('id'), true));