Revert "db: Capitalize `Database` constructor"
Revert "db: Capitalize `Database` constructor"

I thought a PR adding capitalized `Database` landed in ueberdb2, but
apparently not.

This reverts commit 611d416d54937fc02f8d0809c6a01f4f42c0fdf0.

storytouch/etherpad-lite,storytouch/etherpad-lite,storytouch/etherpad-lite,ether/etherpad-lite,ether/etherpad-lite,ether/etherpad-lite