Fixed the Intersection_1Ray_Masked unit test.

The test was failing if ray masking support was enabled because it didn't force the usage of the 2-level BVH which, at the moment, is the only BVH that supports ray masking.

Author: scschaefer

UnitTest/radeon_rays_apitest_cl.h

@@ -256,6 +256,7 @@ TEST_F(ApiBackendOpenCL, DISABLED_Intersection_1Ray_Masked)
     Shape* mesh = nullptr;
 
     api_->SetOption("acc.type", "bvh");
+    api_->SetOption("bvh.force2level", 1.f);
 
     // Create mesh
     ASSERT_NO_THROW(mesh = api_->CreateMesh(vertices(), 3, 3 * sizeof(float), indices(), 0, numfaceverts(), 1));