Minor trailing whitespace cleanup (#596)

Remove extra spaces in a number of files.

layers/housenumber/housenumber_centroid.sql

@@ -25,7 +25,7 @@ CREATE OR REPLACE FUNCTION housenumber.flag() RETURNS trigger AS $$
 BEGIN
     INSERT INTO housenumber.updates(t) VALUES ('y')  ON CONFLICT(t) DO NOTHING;
     RETURN null;
-END;    
+END;
 $$ language plpgsql;
 
 CREATE OR REPLACE FUNCTION housenumber.refresh() RETURNS trigger AS

layers/housenumber/layer.sql

@@ -1,5 +1,5 @@
 
--- etldoc: layer_housenumber[shape=record fillcolor=lightpink, style="rounded,filled",  
+-- etldoc: layer_housenumber[shape=record fillcolor=lightpink, style="rounded,filled",
 -- etldoc:     label="layer_housenumber | <z14_> z14+" ] ;
 
 CREATE OR REPLACE FUNCTION layer_housenumber(bbox geometry, zoom_level integer)