Allow editing posts on Mastodon

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

app/soapbox/utils/features.ts

@@ -172,6 +172,8 @@ const getInstanceFeatures = (instance: Instance) => {
       v.software === PLEROMA && gte(v.version, '0.9.9'),
     ]),
 
+    editStatuses: v.software === MASTODON && gte(v.version, '3.5.0'),
+
     /**
      * Soapbox email list.
      * @see POST /api/v1/accounts