Cleanup: remove redundant braces from assert & raise

autopep8 v1.7 added a space after assert & raise,
remove the braces as they aren't needed.

release/scripts/startup/bl_operators/uvcalc_lightmap.py

@@ -452,7 +452,7 @@ def lightmap_uvpack(
                         pretty_faces.append(pf_parent)
 
                         w, h = pf_parent.width, pf_parent.height
-                        assert(w <= h)
+                        assert w <= h
 
                         if w == h:
                             even_dict.setdefault(w, []).append(pf_parent)