Fixes#1285.
If running Windows 10 19597 or later, the underlying issue has
been addressed, so disable the mitigation for new installs of
the keyboard. Does not attempt to change the language code if
the keyboard is already installed.
The keyboard profile and registration strategy was not taking into
account the mitigation for Win10 1803 (#1285) and this meant that the
Amharic, Tigrigna and Sinhala keyboards would not install correctly.
