browser: switch from static to sql-based relations.json

Which was the only user of the old file.

Change-Id: I1b1be046be403a050723f4206268b61540d9fbf5

src/browser/main.ts

@@ -101,7 +101,7 @@ async function onGpsClick()
     }
 
     // Now fetch the list of relations we recognize.
-    url = config.uriPrefix + "/static/relations.json";
+    url = config.uriPrefix + "/api/relations.json";
     request = new Request(url);
     createLoader(gps, getOsmString("str-relations-wait"));
     let knownRelations: Array<number> = null;