Fixes missing material reference in ModelRenderer

Missed in 18a16aa135

source/renderer/ModelRenderer.cpp

@@ -500,7 +500,7 @@ void ShaderModelRenderer::Render(
 		for (size_t i = 0; i < m->submissions[cullGroup].size(); ++i)
 		{
 			CModel* model = m->submissions[cullGroup][i];
-			const CMaterial material{model->GetMaterial()};
+			const CMaterial& material{model->GetMaterial()};
 			const CShaderDefines& defines{material.GetShaderDefines()};
 			const CStrIntern shaderEffect{material.GetShaderEffect(materialPass)};
 			SMRMaterialBucketKey key(shaderEffect, defines);