rx.selected_files should return file names instead of paths

[bertbarabas]

Currently for at least Chrome, Edge & Brave browsers the path is always just the file name prefixed with ./

I use selected_files to display the selected files on the UI and the ./ prefix just adds confusion so I end up checking for it and removing it every-time.

It'd be fine if selected_files would offer the choice of path or file name.

Also the id of the selected_files(id) only works if it is passed as a literal string. It should work if it is a var.

[linear]

ENG-6433 rx.selected_files should return file names instead of paths