Reverted erroneous change of Speedtest URL from /config to /fiber/config

Change-Id: I00eb42c9083da09d9830cd4224d53566e2ac62c2
diff --git a/speedtest/region.cc b/speedtest/region.cc
index ecb1f51..16c40a3 100644
--- a/speedtest/region.cc
+++ b/speedtest/region.cc
@@ -71,7 +71,7 @@
   }
 
   http::Url config_url(options.global_url);
-  config_url.set_path("/fiber/config");
+  config_url.set_path("//config");
   if (options.verbose) {
     std::cout << "Loading regions from " << config_url.url() << "\n";
   }