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The swaymsg 'get_workspaces' command returns workspaces sorted by
output, affecting the code which tries to detect the last workspace.
Sort them by workspace number.

The brightness and max_brightness will return nothing, which to_i turns
into 0, when Solid PowerManagement is not available or starting up.
Just check for 0 before continuing; don't need to overcomplicate it.

This reverts commit bc432157.

It's the one I had to think about the most, so I don't want to forget
why I chose what I did.

This reverts commit 22c3a70b.

Not needed.