Update helpers.shinc
Fixed issue #29 "Copy ROMs doesn't cancel"

* All copy instructions are now protected by an empty string check.
* deleted h_correct_perms in function h_file_loader() since it's called after copying the files
* changed h_correct_perms, it was changing files outside the RetroRig base folder
incorrect merge
Merge pull request #32 from beaumanvienna/master

Fixed issue #29 "Copy ROMs doesn't cancel"