Fix definition for quote in JSON-LD context (mastodon#38686)

Author: ClearlyClaire

app/helpers/context_helper.rb

@@ -44,7 +44,7 @@ module ContextHelper
     },
     quote_requests: { 'QuoteRequest' => 'https://w3id.org/fep/044f#QuoteRequest' },
     quotes: {
-      'quote' => 'https://w3id.org/fep/044f#quote',
+      'quote' => { '@id' => 'https://w3id.org/fep/044f#quote', '@type' => '@id' },
       'quoteUri' => 'http://fedibird.com/ns#quoteUri',
       '_misskey_quote' => 'https://misskey-hub.net/ns#_misskey_quote',
       'quoteAuthorization' => { '@id' => 'https://w3id.org/fep/044f#quoteAuthorization', '@type' => '@id' },