This commit fixes the issue introduced in #6023
The clicks on folder names direct the users inside the folders; while
the clicks on file names don't download the files, and will open file
previews on a separate modal in the future. Additionally, when a file
has been selected using the checkbox, it can now be downloaded without
being inside a zip file.
Fixes#6026
This commit has been done according to @abperiasamy's feedback as we
are going to reserve the click on file icon to open the preview modal
in the future.
Also, when the user now selects a single file, the file itself is
downloaded instead of a .zip file containing the file.
Fixes#6019
