Convert test-build to string to ensure it works with numbers (#1008)

- When the test-build is a number, the toUppercase will fail
  otherwise.
- People will use teamcity/jenkins build IDs for test-build

dashboard/js/dashboard.js

@@ -182,7 +182,7 @@ function searchTestsList() {
         $(".list-group-item").each(function(){
             $(this).hide();
             const currentKeyword = $(this).text().toUpperCase() + $(this).data("browser").toUpperCase() +
-                $(this).data("platform").toUpperCase() + $(this).data("test-build").toUpperCase() +
+                $(this).data("platform").toUpperCase() + $(this).data("test-build").toString().toUpperCase() +
                 $(this).data("test-status").toUpperCase() + $(this).data("proxy-name").toUpperCase() +
                 $(this).data("time-zone").toUpperCase();
             let allTokensFound = true;