System.pm: Fixes diskspaceinfo without parameters
System.pm: Fixes diskspaceinfo without parameters

System.pm:
- Fixed error when diskspaceinfo was called without folder parameter (to show all disks)
- Error was introduced by setting quotes for folder

mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry