RenderManRenderTest : Fix wedge test.
RenderManRenderTest : Fix wedge test.

This was failing because it wasn't specifying the region to sample to the ImageStats node.

GafferHQ/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,hradec/gaffer,hradec/gaffer,ivanimanishi/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,chippey/gaffer,ImageEngine/gaffer,lucienfostier/gaffer,appleseedhq/gaffer,chippey/gaffer,boberfly/gaffer,hradec/gaffer,ivanimanishi/gaffer,lucienfostier/gaffer,boberfly/gaffer,andrewkaufman/gaffer,hradec/gaffer,GafferHQ/gaffer,ivanimanishi/gaffer,chippey/gaffer,boberfly/gaffer,appleseedhq/gaffer,johnhaddon/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer,ImageEngine/gaffer,hradec/gaffer,johnhaddon/gaffer,appleseedhq/gaffer,appleseedhq/gaffer,boberfly/gaffer,ivanimanishi/gaffer,ImageEngine/gaffer,andrewkaufman/gaffer,chippey/gaffer,johnhaddon/gaffer