In bug 1780093 we discovered that our usage of the SurfaceControl
compositing path was preventing the text selection magnifier from
working. We attempted to toggle the SurfaceControl compositing path
off when the magnifier was active, however this has caused much more
severe issues with rendering content at the wrong size after the
keyboard has been dismissed.

For now, stop toggling SurfaceControl usage until we have found out
how to do so without rendering at the wrong size. This will mean the
magnifier will once again not work.

Differential Revision: https://phabricator.services.mozilla.com/D155202