Revert "temporarily reduce SESSION_COOKIE_AGE (#18689)" (#18698)
Revert "temporarily reduce SESSION_COOKIE_AGE (#18689)" (#18698)

This reverts commit d94c66ceb96fe2b37ab3f926903dcaa5be5b733b.
mozilla/addons-server,wagnerand/addons-server,diox/olympia,diox/olympia,diox/olympia,wagnerand/addons-server,mozilla/olympia,mozilla/olympia,mozilla/addons-server,mozilla/olympia,diox/olympia,wagnerand/addons-server,mozilla/addons-server,wagnerand/addons-server,mozilla/olympia,mozilla/addons-server