When the theme variables were moved to the backend instead of `rc.lua`,
some magic was added to disable them if the user set the border. However,
some undocumented `awful.placement` code also set them and turned off
the theme variables. So it worked *once* then stopped working.
If client client was tiled, the `fallback` could be
`theme.border_color_normal`, but if the client was
tiled, this fallback was never tried.
Now it tests for both "floating" and "active" fallbacks.
This problem actually affects the default theme.
This caused a behavior change it wasn't clear how to use the
permission API to change the focus mode.
The change will only take effect if the user override the API
level.