Clean up feature

[arnabc74]

When I run a shell command from inside nnn (typing ]), the command garbles the screen with its output. It would be helpful if there is a simple keyboard shortcut to restore the nnn screen (the file listing). Of course, I can always go up the directory tree and then come down afresh, but a single key solution would have been better.

[ndegruchy]

It looks like CTRL-L does this already.