keylaunch-conf: Never-ever use "Pressed" events in public configs.

keylaunch-conf: Never-ever use "Pressed" events in public configs.
* It is possible to unambigously distingish events only of two types:
<default> (short press) and "Held" (long press). Using any other event
type is ambigous. In particular, with the old default config there was
ambiguity with power off and backlight toggle bindings - most of the time,
backlight toggling also caused power off. As freedom of using any key in any
way should be left to user, ambigouos bindings should be avoided.