Disable PrivacySettingsRedesign experiment in fieldtrial_testing_config

This experiment was enabled in fieldtrial_testing_config, because it
was being rolled out in Chrome M80.

However, the experiment with a same name is being reused in M81/M82
code, where it's disabled again for the time being, and so it should be
disabled in fieldtrial_testing_config too.

Bug: 1032584
Change-Id: Ic903f1c082350d7067aaadbafee49b73772a21a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2064998
Commit-Queue: Martin Šrámek <msramek@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743175}

testing/variations/fieldtrial_testing_config.json

@@ -4641,27 +4641,6 @@
             ]
         }
     ],
-    "PrivacySettingsRedesignTest": [
-        {
-            "platforms": [
-                "windows",
-                "mac",
-                "chromeos",
-                "linux",
-                "android",
-                "android_webview",
-                "ios"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "PrivacySettingsRedesign"
-                    ]
-                }
-            ]
-        }
-    ],
     "ProactivelySwapBrowsingInstance": [
         {
             "platforms": [