Add IE/Edge versions for api.KeyboardEvent.getModifierState (#12812)
Add IE/Edge versions for api.KeyboardEvent.getModifierState (#12812)

This commit adds real values for Internet Explorer and Edge for the `getModifierState` member of the `KeyboardEvent` API, based upon manual testing.
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data