Two problems caused Boolean options which default to true to be shown
incorrectly when the option was not already present in the defaults database.
First a typo (Enabled instead of Selected) caused the switch button to stay
off then because GetBoolForKey key returns False also when the option
is not set it would have been turned off while it should stay on to
reflect the default value of the option.
Managed to squeeze two more options from the expert page to the
corresponding pages and also reorganised some widgets to avoid large
now unused spaces in one place and clipped text in the other.
Move bounce options from expert prefs to its own box on ergonomic
prefs to have them at one place which makes them somewhat more clear.
The options previously occupying this place have been moved to other
pages where they better belong.