Enable keyboard popovers by default. This feature is also enabled in
osk-sdl by default, so have it here too in order to not have a
regression for users when switching from osk-sdl to unl0kr.
This can be enabled by setting the `general.timeout` configuration.
Timeout must be specified in seconds, and the max ceiling is 3600 (one hour).
Specifying 0 (default) will disable this feature.
Signed-off-by: Eugenio Paolantonio (g7) <me@medesimo.eu>