allow for overlap between string and const

src/schemas/json/declarative-net-request-ruleset.json

@@ -438,7 +438,7 @@
                     "scheme": {
                       "$comment": "TODO: Require host when extension scheme is used.",
                       "description": "The new scheme for the request. Allowed values are \"http\", \"https\", and the scheme of the extension, for example, \"moz-extension\" in Firefox or \"chrome-extension\" in Chrome. When the extension scheme is used, the host must be specified to generate a meaningful redirection target.\n\nhttps://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/declarativeNetRequest/URLTransform#scheme",
-                      "oneOf": [
+                      "anyOf": [
                         {
                           "const": "http"
                         },