Fix #30320: Shading issue with boolean modifier

Seems that after converting tessfaces into faces normals should be re-calculated.
At least that's what happening in some other modifiers and what makes boolean
work fine with smooth normals.

source/blender/modifiers/intern/MOD_boolean_util.c

@@ -466,6 +466,7 @@ static DerivedMesh *ConvertCSGDescriptorsToDerivedMesh(
 	CDDM_calc_edges_tessface(result);
 
 	CDDM_tessfaces_to_faces(result); /*builds ngon faces from tess (mface) faces*/
+	CDDM_calc_normals(result);
 
 	return result;
 }