gui: disable font antialiasing for QR image address
gui: disable font antialiasing for QR image address

More info available here: https://doc.qt.io/qt-5/qfont.html#StyleStrategy-enum


Former-commit-id: 3ac29bb0e45163f38eab16f7ce34dc3d236ee54a
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin