Fix defaults sent to TT subclasses. Basically, don't send any.

Hi. This is a problem I had earlier converting an existing subclassed TT app to Dancer. Dancer silently changed ANYCASE blowing the app up because it used reserved words everywhere as variables. This change nixes Dancer defaults when using TT subclass. The theory is the existing subclass already does things how it needs them done, so don't fool with it. The patch honors settings in config.yml, if they exist, but doesn't add any baggage if the user didn't explicitly say to. I've left the tags alone here since I've another PR regarding their quoting. I'll come back to it after the dust settles... or not. Your call. Thanks.