Use default_public_interface_only in Chromium-based browser

Related feedback:
- https://www.reddit.com/r/uBlockOrigin/comments/hbea3z/

It appears the implementation of the `disable_non_proxied_udp`
setting changed in Chromium, leading to WebRTC becoming
wholly unfunctional. Fall back to use `default_public_interface_only`
in Chromium-based browsers.

platform/chromium/vapi-background.js

@@ -184,7 +184,7 @@ vAPI.browserSettings = (( ) => {
                 // https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/privacy/network#Browser_compatibility
                 //   Firefox 70+ supports `disable_non_proxied_udp`
                 const value =
-                    vAPI.webextFlavor.soup.has('firefox') &&
+                    vAPI.webextFlavor.soup.has('firefox') === false ||
                     vAPI.webextFlavor.major < 70
                         ? 'default_public_interface_only'
                         : 'disable_non_proxied_udp';