go-tour: fix error highlighting when running locally

Fixes #9119.

LGTM=adg
R=adg
CC=golang-codereviews
https://golang.org/cl/177980043
diff --git a/static/js/services.js b/static/js/services.js
index 233d876..c507af2 100755
--- a/static/js/services.js
+++ b/static/js/services.js
@@ -38,7 +38,7 @@
                 if (write.Kind == 'stderr') {
                     var lines = write.Body.split('\n');
                     for (var i in lines) {
-                        var match = lines[i].match(/prog\.go:([0-9]+): ([^\n]*)/);
+                        var match = lines[i].match(/.*\.go:([0-9]+): ([^\n]*)/);
                         if (match !== null) {
                             editor.highlight(match[1], match[2]);
                         }