Do "SCROLL to change player" visible in any standard aspect ratio

Above text was cut for aspect ratio 5:4 (quite much) and 4:3 (a little) for
previous value "left = (VIRTW*3/2)*6/8"
Two fixes concerning items selection in menu

The first fixes the last use of menusel, that wasn't checked for range yet.
The second one brings menusel back into range, if there is no
refresh function.
Show list of demos in "Download demo" menu