Don't recreate via rule if either layer is square
Don't recreate via rule if either layer is square

There are a couple of warnings when using the sky130 hd tech:

[WARNING DRT-0160] Warning: met2 does not have viaDef aligned with layer direction, generating new viaDef via2_FR.
[WARNING DRT-0160] Warning: met4 does not have viaDef aligned with layer direction, generating new viaDef via4_FR.

In both cases the layer is square, so the warning is harmless, but we
may as well catch this case and avoid the warning altogether.

The-OpenROAD-Project/OpenROAD,The-OpenROAD-Project/OpenROAD,The-OpenROAD-Project/OpenROAD,QuantamHD/OpenROAD,QuantamHD/OpenROAD,The-OpenROAD-Project/OpenROAD,The-OpenROAD-Project/OpenROAD,QuantamHD/OpenROAD,QuantamHD/OpenROAD,QuantamHD/OpenROAD