ruadlist doesn't work right with Brave's adblocker

Since Brave's adblocker announced it's compatible with UbO's filters, I used [RuAdList-uBO.txt](https://github.com/easylist/ruadlist/blob/master/RuAdList-uBO.txt) only to realize it doesn't support a filter including other filters like that. I ended up have to add each filter file of the ruadlist collection manually (so many of them!). It's somewhat worked, but still not as optimal as it is on UbO. On news.mail.ru there is still empty ad container boxes. These boxes should be removed (as they are on UbO). I'm always using dark mode, having a white box on a dark background make my eyes hurt. Please fix it.

Update: my guess is Brave's adblocker does not fully support all of UbO's features so filter lists like css-fixes-experimental.txt and js-fixes-experimental.txt doesn't work optimally, I might have to install Stylus and ViolenMonkey to use the corresponding fixes like when using with Adblock Plus as stated on the [easylist forum](https://forums.lanik.us/viewtopic.php?t=22512-%D0%BE-%D1%84%D0%B8%D0%BB%D1%8C%D1%82%D1%80%D0%B5-ru-adlist-%D0%B8-%D0%B4%D0%BE%D0%BF%D0%BE%D0%BB%D0%BD%D0%B5%D0%BD%D0%B8%D1%8F%D1%85). But, it shouldn't be the case! Brave's adblocker should be compatible with all UbO filters isn't it?

Start by reproducing the issue on news.mail.ru with RuAdList-uBO.txt and the individual ruadlist files in Brave's adblocker. Compare the handling of filter inclusion and the css-fixes-experimental.txt and js-fixes-experimental.txt files with uBlock Origin. Done means the filter collection works as expected and the empty ad containers are removed.

Written by the indexing model from the issue text.