[HaTS] Change Finch test config for stable launch

The change is to prepare for stable 1% launch at CL/293181353.

BUG=none

Change-Id: Ib0a583917c5b9d4858bbf4cb73c8386f44a0fa33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036798Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738399}

testing/variations/fieldtrial_testing_config.json

@@ -1952,10 +1952,10 @@
             ],
             "experiments": [
                 {
-                    "name": "EnabledNTP79",
+                    "name": "EnabledNTP80",
                     "params": {
-                        "en_site_id": "ty52vxwjrabfvhusawtrmkmx6m",
-                        "probability": "0.4",
+                        "en_site_id": "tbl7ghvx6q4sth3jzfxynlvnxi",
+                        "probability": "0.01",
                         "survey": "satisfaction"
                     },
                     "enable_features": [