vt: indent switch-case in setterm_command properly

Shift cases one level left. This makes the code more readable and some
lines need not wrap anymore.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20200316065911.11024-3-jslaby@suse.cz


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>