neg: fix/enhance behaviour of auto-toggles

Currently auto-toggles for whole screen and selected windows fight together plus the fact that deactivating a default also deactivates corresponding current state. This commit fixes all this by forcing activation of a toggle if not already active but keeping current state the same otherwise. Also toggling one of the option while the other is still active AND both match some window will not double-toggle anymore.

Fixes #47 (closed).