entity normalizer: provide summary_html property

Mastodon API returns HTML always in spoiler_text, while TwitterAPI sends both a
text version as well as an HTML version of the message subject, which we started
to use when we allowed custom emoji in message subjects.

src/services/entity_normalizer/entity_normalizer.service.js

@@ -164,6 +164,7 @@ export const parseStatus = (data) => {
     }
 
     output.summary = data.spoiler_text
+    output.summary_html = data.spoiler_text
     output.external_url = data.url
 
     // FIXME missing!!
@@ -203,6 +204,7 @@ export const parseStatus = (data) => {
     }
 
     output.summary = data.summary
+    output.summary_html = data.summary_html
     output.external_url = data.external_url
     output.is_local = data.is_local
   }