Resolution for Issue750

This resolves Issue 750 posted earlier. Since a theme might be shared by more than one site, the hash() based lookup struct was improperly screening out the second -> Nth sites that attempted to run the theme/config.xml.cfm.

I can't see any other way that a theme could be initialized by this code twice, and the struct doesn't appear to be used anywhere else, so I removed the struct key lookup entirely.