mpg123: remove LICENSE_FLAGS

mgp123 is patent free from version 1.25.0, so remove LICENSE_FLAGS.

https://mpg123.de/cgi-bin/news.cgi#2017-05-29

(From OE-Core rev: b0bc82a5f238db82425b3b146e269bc6605cbdce)

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-multimedia/mpg123/mpg123_1.25.10.bb

@@ -7,7 +7,6 @@ BUGTRACKER = "http://sourceforge.net/p/mpg123/bugs/"
 SECTION = "multimedia"
 
 LICENSE = "LGPLv2.1"
-LICENSE_FLAGS = "commercial"
 LIC_FILES_CHKSUM = "file://COPYING;md5=1e86753638d3cf2512528b99079bc4f3"
 
 SRC_URI = "https://www.mpg123.de/download/${BP}.tar.bz2"