fix: add required field to data_collection_permissions

AMO requires the "required" property in data_collection_permissions.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: vveerrgg

src/firefox-manifest.json

@@ -56,6 +56,7 @@
             "id": "nostrkey@nostrkey.com",
             "strict_min_version": "109.0",
             "data_collection_permissions": {
+                "required": false,
                 "personally_identifying_info": false,
                 "health_info": false,
                 "financial_info": false,