Items not blended in ordered group

In OGL 2.7, objects in ordered group are not transparent, probably because they are not blended. 

The problem begins from commit 7cb740b ("Fix blending issues in ordered group", 2020-02-21).

If we change the following line at /ogl-runtime/src/runtimerender/rendererimpl/Qt3DSRendererImplLayerRenderData.cpp:975  back to 2.6, it would work again.

if (object.m_RenderableFlags.hasAlphaTest() || hasTransparency) { // 2.7

if (object.m_RenderableFlags.hasAlphaTest()) {                               // 2.6