curl: Correct LICENSE from MIT-open-group to curl

LICENSE for curl is set to MIT-open-group which is wrong and proper
license is 'curl'

I check below link and the line "Curl and libcurl are licensed under
the license below, which is inspired by MIT/X, but not identical." says
that the license is identical to MIT but actual license is identical
from the file "meta/files/common-licenses/curl"
Link: https://curl.se/docs/copyright.html



Also, I do not find the MIT-open-group license text in the entire
source-code

(From OE-Core rev: 34b228bd)

Signed-off-by: Ranjitsinh Rathod <ranjitsinh.rathod@kpit.com>
Signed-off-by: Ranjitsinh Rathod <ranjitsinhrathod1991@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 4a246e06cb62efff8bfd20cdf3dde31e24f9b711)
Signed-off-by: Ranjitsinh Rathod <ranjitsinhrathod1991@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>