WebUI: Improve filter lists
This PR adds following improvements:
* Remove unused tracker entries while processing sync data
* Take into account filter selection & terms when performing 'Start/stop/delete' context actions in filter lists
Now, only filtered torrents will be affected by them, just like in the GUI.
* Provide better feedback when performing 'Start/stop/delete' context actions in filter lists
Small improvement over GUI - now these actions will be disabled if it's not possible to use them.
* Add context menu to status filter list
* Fix error when toggling filter title
Fixup for small bug introduced in https://github.com/qbittorrent/qBittorrent/pull/21269
PR #21438.