Simplify mirroring for Edge (#17038)
Simplify mirroring for Edge (#17038)

No special case for changes before Edge 79 is not needed, it is handled
by the version_added === version_removed check.

This does not result in any changes to the built data.
mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data