filteredquery: whitespace cleanup

Change-Id: I3d52a6edaebc21c8f1e37521d4862f4d9d3da3c1
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6906
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

filteredquery: miscellaneous fixes

* Remove the TFilteredQuery::GetNextDirents() stub as it was preventing the
results from showing

* Fix the getopt string so that a -p argument is recognized

* Move the folder_params declaration out one level so that it doesn't go
out of scope when needed

* Clean up the help output

Change-Id: If37c300b4b67773ffc33fd637c2ef9add3c12275
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6901
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

Add filteredquery command.
This code was rotting on my hard drive for years. Maybe it could be
extended.

Add filteredquery command.
This code was rotting on my hard drive for years. Maybe it could be
extended.