Set the functional_class of bikeable service roads to unclassified

Service roads are only recognized as bikeable if they
also are tagged "bicycle=yes/permissive/designated."
That is correct, however they should only show up as a road,
not as a bike path. This commit changes the functional_class
of bikeable service roads to unclassified, which is more appropriate
given that they have the following characteristics:
25mph speed limit, 1 lane, parking allowed, and 27ft roadway width.

Author: lalver1

brokenspoke_analyzer/scripts/sql/features/functional_class.sql

@@ -100,7 +100,7 @@ WHERE
     AND COALESCE(width_ft, 0) >= 8;
 
 UPDATE neighborhood_ways
-SET functional_class = 'path'
+SET functional_class = 'unclassified'
 FROM neighborhood_osm_full_line AS osm
 WHERE
     neighborhood_ways.osm_id = osm.osm_id