shortbread: Allow multiple OSM tags for POIs

Shortbread specifies a feature can have multiple tags that cause
it to be included in the pois table, and all of those tags are
present as fields.

Author: pnorman

themes/shortbread_v1/topics/pois.lua

@@ -154,7 +154,6 @@ local get_attributes = function(object)
                 add_extra_attributes[k](a, t)
             end
             is_poi = true
-            break
         end
     end