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
* format js files using prettier
Used the following command to format the files
prettier --write "browser/app/js/**/*.js"
* fix failing unit tests in browser
