Fixed critical bug EXT-6847 (Default configuration has Away Timeout set to "Never")
Fixed critical bug EXT-6847 (Default configuration has Away Timeout set to "Never")

Reason: changeset 97654b5b6313 for EXT-4843 [NUX] Set default Preferences. Setting was reset to 0.

Fix: restored default value 300. Also updated setting's description with supported combobox values (0, 120, 300, 600, 1800)

Reviewed by Vadim at https://codereview.productengine.com/secondlife/r/234/

gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm