fix image texture node.
fix image texture node.

beasterio/FireRays_SDK,FlorentGuinier/RadeonRays_SDK,GPUOpen-LibrariesAndSDKs/RadeonRays_SDK,FlorentGuinier/RadeonRays_SDK,beasterio/FireRays_SDK,FlorentGuinier/RadeonRays_SDK,beasterio/FireRays_SDK,GPUOpen-LibrariesAndSDKs/RadeonRays_SDK,GPUOpen-LibrariesAndSDKs/RadeonRays_SDK