Don't copy color layer unnecessarily
Don't copy color layer unnecessarily

If the color layer uses the same UFO layer as the base one, then no need
to copy the layer at all. For example:

      <key>com.github.googlei18n.ufo2ft.colorLayerMapping</key>
      <array>
        <array>
          <string>public.default</string>
          <integer>0</integer>
        </array>
      </array>

googlefonts/ufo2ft,jamesgk/ufo2fdk,googlei18n/ufo2ft