equalize_sidebearings.py: Remove unused import
equalize_sidebearings.py: Remove unused import

From the inspection code that I removed in
76e0ea2b4dab01bef29e9a18589a32897b49de45.

teddywing/RoboFont-Equalize-Sidebearings-Key,teddywing/RoboFont-Equalize-Sidebearings-Key