Add mitigation for nationalgrid

[GuiltyDolphin]

Mitigates nationalgrid.co.uk in #326.

Asana: https://app.asana.com/0/1200277586140538/1204522885984681/f

[github-actions]

Generated file outputs:

legacy

fingerprinting.json (3 more)

• fingerprinting.json
• protections.json
• trackers-unprotected-temporary.txt
• trackers-whitelist-temporary.txt

⚠️ File is identical

v1/android-config.json (13 more)

• v1/android-config.json
• v1/extension-brave-config.json
• v1/extension-bravemv3-config.json
• v1/extension-chrome-config.json
• v1/extension-chromemv3-config.json
• v1/extension-config.json
• v1/extension-edg-config.json
• v1/extension-edge-config.json
• v1/extension-edgmv3-config.json
• v1/extension-firefox-config.json
• v1/extension-safarimv3-config.json
• v1/ios-config.json
• v1/macos-config.json
• v1/windows-config.json

--- v1/windows-config.json
+++ v1/windows-config.json
@@ -120,8 +120,12 @@
                     "domain": "ksta.de",
                     "reason": "https://github.com/duckduckgo/privacy-configuration/issues/326"
                 },
                 {
+                    "domain": "nationalgrid.co.uk",
+                    "reason": "https://github.com/duckduckgo/privacy-configuration/issues/326"
+                },
+                {
                     "domain": "t-online.de",
                     "reason": "https://github.com/duckduckgo/privacy-configuration/issues/326"
                 },
                 {

latest

v2/android-config.json (13 more)

• v2/android-config.json
• v2/extension-brave-config.json
• v2/extension-bravemv3-config.json
• v2/extension-chrome-config.json
• v2/extension-chromemv3-config.json
• v2/extension-config.json
• v2/extension-edg-config.json
• v2/extension-edge-config.json
• v2/extension-edgmv3-config.json
• v2/extension-firefox-config.json
• v2/extension-safarimv3-config.json
• v2/ios-config.json
• v2/macos-config.json
• v2/windows-config.json

--- v2/windows-config.json
+++ v2/windows-config.json
@@ -120,8 +120,12 @@
                     "domain": "ksta.de",
                     "reason": "https://github.com/duckduckgo/privacy-configuration/issues/326"
                 },
                 {
+                    "domain": "nationalgrid.co.uk",
+                    "reason": "https://github.com/duckduckgo/privacy-configuration/issues/326"
+                },
+                {
                     "domain": "t-online.de",
                     "reason": "https://github.com/duckduckgo/privacy-configuration/issues/326"
                 },
                 {