Revert "Fix IE11 sniffing. Fixes #17311."

This reverts commit f58c0e19ce509398985908688a768c8fb41191b8.
Correct detection of focusin support

Fixes #17599
Add Microsoft-recommended UA sniff for IE11

Fixes #17311
Remove dumb speed test that compares against an old API we will never restore

Fixes #11200
Support unprefixed pointer events in dojo/touch

Refs #17600
Add Trident UA to match every other UA

Refs #17311