vt: selection, indent switch-case properly

Shift the cases one level left as this is how we are supposed to write
the switch-case code according to the CodingStyle.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20200219073951.16151-9-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>