Avoid setting unnecessary parameters in QOpenGLWidget

QOpenGLFramebufferObject sets the texture parameters already, do
not set them again. Especially not GL_REPEAT, which is wrong and
breaks on devices that do not support REPEAT on NPOT textures.
What QOpenGLFramebufferObject does is just fine (it sets NEAREST/
NEAREST and CLAMP_TO_EDGE).

This is important for WebEngine where the QWidget-based web view
is using QOpenGLWidget.

Change-Id: I264d30118ce7adf50f68f2c7b9a5599a406b4362
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
QNX: Fix tst_selftest

GRAPHICS_ROOT and TZ environment variables are needed in child
processes in order to successfully run the auto test selftests.

Change-Id: I7befabd535b4c47b1e75acbe3d6158d0d9b811b3
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>