webmin: Clarify BSD license variant

The License of webmin is BSD-3-Clause.

Signed-off-by: Christophe Priouzeau <christophe.priouzeau@st.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-webserver/recipes-webadmin/webmin/webmin_1.850.bb

@@ -1,6 +1,6 @@
 SUMMARY = "Web-based administration interface"
 HOMEPAGE = "http://www.webmin.com"
-LICENSE = "BSD"
+LICENSE = "BSD-3-Clause"
 LIC_FILES_CHKSUM = "file://LICENCE;md5=0373ac9f611e542ddebe1ec6394afc3c"
 
 SRC_URI = "${SOURCEFORGE_MIRROR}/webadmin/webmin-${PV}.tar.gz \