BUG: 8337 - scaffolding of SS_Datetime is not working with Default DateTime settings

Currently when you have your date time settings set to include AM or PM if you have times in the Database such as 00:00:00 this is being cast to 12:00 AM and then to 12:00 and thus loses the AM/PM so when outputed via model admin this then displays 12:00 PM not 12:00 AM.  Updating the default config fixes this and also makes the default config match SilverStripes Default user setup as well.