Fix Database Explorer and Connection release for it.

After the upgrade the Database Explorer tad came crooked and unreachable. Unable to expand and bring it to the top.  Please fix.  

The most important ask please make the connection retention "0" works as expected.  With "0" setting Aginity Database Explorer still creates new connection each time a DB Explorer object folder is expanded. This makes the DB Explorer useless with Okta authentication security authenticating every new connection.   FYI, lookup the SQL Workbench/J they have no such problem utilizing the same connection and not releasing it.