[Glitch] Add option to be notified when a followed user posts

Port 974b1b79ce to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/components/status.js

@@ -680,6 +680,7 @@ class Status extends ImmutablePureComponent {
         favourite: 'favourited',
         reblog: 'boosted',
         reblogged_by: 'boosted',
+        status: 'posted',
       }[prepend];
 
       selectorAttribs[`data-${notifKind}-by`] = `@${account.get('acct')}`;