vt: whitespace and paren cleanup in add_softcursor

Format add_softcursor according to CodingStyle. Until now, it was a mess
of letters.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20200615074910.19267-24-jslaby@suse.cz


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