This commit removes the unnecessary `data-list-widget` attribute
present in the <div> and <tbody> tag for muted_topics and muted_users table.
It became unnecessary/useless in 19cf6d0e04 and
then was renamed while still useless.
Also uses the correct variable name `muted_topic` and `muted_user`
instead of `muted_topics` and `muted_users` to render a item of their list
in DOM through Listwidget.
This fixes a bundle of issues where we were missing "" around
attributes coming from variables. In most cases, the variables were
integers or fixed constants from the Zulip codebase (E.g. the name of
an installed integration), but in at least one case it was
user-provided data that could potentially have security impact.
The set_up_muted_topics_ui and templates have been
refactored to use list_render.
This is done to support filtering and sorting of
the muted stream topics.
This also includes the addition of a new Date muted header.
jai2201
Tim Abbott
Ryan Rehman
Anders Kaseorg