Comment in locked posts as admin/mod

Lemmy version 0.19.4 added the ability for admins and mods to comment in locked posts. This is handy sometimes.

https://github.com/LemmyNet/lemmy/pull/4488

https://join-lemmy.org/news/2024-06-07_-_Lemmy_Release_v0.19.4_-_Image_Proxying_and_Federation_improvements