LibWeb: Port NavigatorID from DeprecatedString to String

Author: https://github.com/shannonbooth
Commit: 6aff55d655
Pull-request: https://github.com/SerenityOS/serenity/pull/21997
Reviewed-by: https://github.com/AtkinsSJ ✅

Userland/Services/WebContent/ConnectionFromClient.cpp

@@ -451,7 +451,7 @@ void ConnectionFromClient::debug_request(DeprecatedString const& request, Deprec
     }
 
     if (request == "spoof-user-agent") {
-        Web::ResourceLoader::the().set_user_agent(argument);
+        Web::ResourceLoader::the().set_user_agent(MUST(String::from_deprecated_string(argument)));
         return;
     }