licenses.conf: Fix variable name in comments (FOSS_NO_COPYRIGHT)

licenses.conf: Fix variable name in comments (FOSS_NO_COPYRIGHT)

A FOSSology related variable was renamed from FOSS_COPRYIGHT to
FOSS_NO_COPYRIGHT, but the comment block describing the variable
in licenses.conf was missed.

Besides fixing this, this change also removes a redundant comment
about where the variable is defined (it's right there! ;-)).

(From OE-Core rev: 5f08d4ea1b4ddf04d7f1d8aa38c0dac9b1af44bc)

Signed-off-by: Olof Johansson <olofjn@axis.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>