Update blocks/FMOD/templates/Basic FMOD/src/_TBOX_PREFIX_App.cpp

Fixed two issues with the FMOD Basic template.
See: https://forum.libcinder.org/topic/rfc-app-rewrite#23286000001400003
Merge pull request #266 from paulhoux/appRewrite

Update blocks/FMOD/templates/Basic FMOD/src/_TBOX_PREFIX_App.cpp