Fix routing of smartsensor board after 2x5 change.

The arrangement of the VCC/GND planes and overlapping pads of the
sideways smartsensor conenctor interact in a strange way and
cause EAGLE to not clearly indicate the presence of airwires.

This commit repairs the airwires introduced in the 2x4 --> 2x5 change
that were hidden by this idiosyncracy of EAGLE.