Port task switchers to use standard sizes for everything else
This completes the work started in 16ff74c0 and uses standard sizes for everything else that's currently hardcoded. The result is not as dramatic, but it fixes all remaining minor visual glitches when using a high DPI screen.
All Task Switchers are tested and the changes produce no visual regressions that I can see.
Could we target 5.18 for this?