Avoid renaming banned files

2019-02-07 14:30:47 50165 123145584779264 TRACE    nxdrive.engine.watcher.local_watcher Queueing watchdog: <FileCreatedEvent: src_path='/Users/bob/Nuxeo Drive/Icon\r'>
2019-02-07 14:30:47 50165 123145584779264 TRACE    nxdrive.engine.watcher.local_watcher Queueing watchdog: <DirModifiedEvent: src_path='/Users/bob/Nuxeo Drive'>
2019-02-07 14:30:47 50165 123145572122624 DEBUG    nxdrive.engine.watcher.local_watcher Handling watchdog event [created] on '/Users/bob/Nuxeo Drive/Icon\r'
2019-02-07 14:30:47 50165 123145572122624 DEBUG    nxdrive.utils      Forcing space normalization: PosixPath('/Users/bob/Nuxeo Drive/Icon\r') -> PosixPath('/Users/bob/Nuxeo Drive/Icon')
2019-02-07 14:30:47 50165 123145572122624 ERROR    nxdrive.engine.watcher.local_watcher Watchdog exception
Traceback (most recent call last):
  File "engine/watcher/local_watcher.py", line 932, in handle_watchdog_event
    src_path = normalize(evt.src_path)
  File "utils.py", line 443, in normalize_event_filename
    path.rename(stripped)
  File "lib/python3.6/pathlib.py", line 1309, in rename
    self._accessor.rename(self, target)
  File "lib/python3.6/pathlib.py", line 393, in wrapped
    return strfunc(str(pathobjA), str(pathobjB), *args)
PermissionError: [Errno 13] Permission denied: '/Users/bob/Nuxeo Drive/Icon\r' -> '/Users/bob/Nuxeo Drive/Icon'