Save ACL entries when in headless mode, so going non-headless doesn't

ask for them again.

src/libtomahawk/AclRegistry.cpp

@@ -180,6 +180,7 @@ ACLRegistry::isAuthorizedUser( const QString& dbid, const QString &username, ACL
 #endif
 
     m_cache.append( user );
+    save();
     emit aclResult( dbid, username, user.acl );
     return user.acl;
 }