[document_repository] files from all directories shown without filtering

[3design]

task
9. Check that expand/collapse works for non-empty categories. Check that when performing a search, the categories containing the resulting files (and only those) are shown in a list format [Manual Testing]

expected results:
when in a directory, only files in that directory are shown in the list

actual results:
all files from all sub directories are shown in the list

comments: For example I have the following files in these directories
root> file1.txt
root> file2.txt
root>level1> file3.txt
root>level1>level1a> file4.txt

I expect to see
root>
file1.txt
file2.txt

I actually see
root>
file1.txt
file2.txt
file3.txt
file4.txt

when in level 1 I see
root>level1
file3.txt
file4.txt

[zaliqarosli]

same issue as #4857

[driusan]

Fixed by @zaliqarosli's PR!