Don't treat various source tags as descriptive tags

modules/osm/tags.js

@@ -2,7 +2,9 @@ export function osmIsInterestingTag(key) {
     return key !== 'attribution' &&
         key !== 'created_by' &&
         key !== 'source' &&
+        key !== 'source_ref' &&
         key !== 'odbl' &&
+        key.indexOf('source:') !== 0 &&
         key.indexOf('tiger:') !== 0;
 }