Neighborhood completion often won't reach 100% #870
Description
While doing some testing to figure out why #868 is happening, I came across a situation where I audited an entire neighborhood, and the completion rate on the choropleth never reached 100%. I have already looked into the code a bit, and realized that I made a mistake in the code that updates the region_completion table after a street is audited. For streets that intersect multiple neighborhoods, I am only adding that distance to one of the neighborhoods that it intersects. Should be an easy fix.