Ignore browser-hosted web-apps in TaskManager-based browser identification
Prevents plasma-browser-integration from sometimes thinking it's your chat app or similar.
Depending on the order of my browser windows, p-b-i no longer sometimes things to be Element webapp.
The following browsers I checked and they all have WebBrowser category: brave, firefox (though that file comes from distro and not upstream?), firefox-trunk, chrome unstable, chrome, MS edge, falkon, vivaldi-stable, vivaldi