FsDiscoverer: Fix probing of interruption & pause
FsDiscoverer: Fix probing of interruption & pause

Move the probe to the main checkFolder loop, instead of the subfolder
one.
This is likely a regression introduced when switching from recursion to
iterative

chouquette/medialibrary,chouquette/medialibrary,chouquette/medialibrary,chouquette/medialibrary