bktr: Fix Fabrice's name

Signed-off-by: Timothy Gu <timothygu99@gmail.com>

This file with the incorrect name was added after the name was fixed in all other files.
This is thus fixing a mistake

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavdevice/bktr.c

@@ -3,7 +3,7 @@
  * Copyright (c) 2002 Steve O'Hara-Smith
  * based on
  *           Linux video grab interface
- *           Copyright (c) 2000,2001 Gerard Lantau
+ *           Copyright (c) 2000, 2001 Fabrice Bellard
  * and
  *           simple_grab.c Copyright (c) 1999 Roger Hardiman
  *