Ticket #2862: fix syncronization with filelist and tree panels
...in case of rename and delete directories.
Steps to reproduce the problem:
* Choose "file listing" mode for one panel and "directory tree" mode for the other.
* Perform all operations on the "file listing" panel.
* Create a new directory -> tree view will update correctly.
* Perform an operation, which changes this directory like rename/delete.
* Deleted directory will still show up on the "directory tree" view.
Renamed directory will show up with the new name, but the old name will also stay there.
Minor cleanup: remove extra parenthesis.
Signed-off-by: Andrew Borodin <aborodin@vmail.ru>