Update the field trial test config for RendererSideResourceScheduler

This is just a renaming change caused by a finch config settings change.

Bug: 794073
Change-Id: I40f18880c76956a1e485ed96274e669723222d5f
Reviewed-on: https://chromium-review.googlesource.com/1067526Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560924}

testing/variations/fieldtrial_testing_config.json

@@ -2945,7 +2945,7 @@
             ],
             "experiments": [
                 {
-                    "name": "Enabled_2_1024",
+                    "name": "Enabled",
                     "params": {
                         "limit": "1024",
                         "tight_limit": "2"