[gold] Fix frontend build

Change-Id: I9fef88d2bddced0d89708088f9c7ab609e483242
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/307617
Reviewed-by: Kevin Lubick <kjlubick@google.com>
diff --git a/golden/modules/search-page-sk/search-page-sk-demo.ts b/golden/modules/search-page-sk/search-page-sk-demo.ts
index 180185d..fe98f4e 100644
--- a/golden/modules/search-page-sk/search-page-sk-demo.ts
+++ b/golden/modules/search-page-sk/search-page-sk-demo.ts
@@ -22,7 +22,7 @@
 
 fetchMock.get('/json/trstatus', () => statusResponse);
 fetchMock.get('/json/paramset', () => paramSetResponse);
-fetchMock.get('glob:/json/search*', (url) => {
+fetchMock.get('glob:/json/search*', (url: string) => {
   const filteredSearchResponse = deepCopy(searchResponse);
 
   // Filter only by untriaged/positive/negative