express: reformat session configuration in preparation for the next commit
express: reformat session configuration in preparation for the next commit

No functional changes.

ether/etherpad-lite,ether/etherpad-lite,joequant/etherpad-lite,joequant/etherpad-lite,joequant/etherpad-lite,aptivate/etherpad-lite,storytouch/etherpad-lite,storytouch/etherpad-lite,aptivate/etherpad-lite,aptivate/etherpad-lite,ether/etherpad-lite,joequant/etherpad-lite,aptivate/etherpad-lite,storytouch/etherpad-lite