graphics/quesa: Fix build with Clang 6

./Source/Renderers/Cartoon/CartoonRenderer.cpp:400:25: error: non-constant-expression cannot be narrowed from type 'int' to 'unsigned char' in initializer list [-Wc++11-narrowing]

UByteColor rgbShade = {m_nShadeLightness, m_nShadeLightness, m_nShadeLightness};
                       ^~~~~~~~~~~~~~~~~

http://beefy11.nyi.freebsd.org/data/head-i386-default/p478276_s338342/logs/errors/quesa-1.8_8.log

• While here fix WWW