Refactors getApplicationFolder class function
Refactors getApplicationFolder class function

- gets rid of not needed NSPredicate;
- gets rid of not needed not toll free bridging Array to NSArray;
- uses URL, preferred way to work with path components in Swift;
- uses `first` instead of `filtered` then accessing first array element by 0 index, which is faster.

dsmelov/simsim,dsmelov/simsim