lib/fs: Fix WatchRename test for FreeBSD (fixes #6613)
lib/fs: Fix WatchRename test for FreeBSD (fixes #6613)

imsodin/syncthing,syncthing/syncthing,syncthing/syncthing,wweich/syncthing,wweich/syncthing,imsodin/syncthing,imsodin/syncthing,imsodin/syncthing,syncthing/syncthing,syncthing/syncthing,wweich/syncthing,imsodin/syncthing,wweich/syncthing,syncthing/syncthing,syncthing/syncthing