Also removing webauthn credentials on 2fa reset with admin cli

lib/mastodon/cli/accounts.rb

@@ -166,6 +166,7 @@ module Mastodon::CLI
       user.disabled = true if options[:disable]
       user.approved = true if options[:approve]
       user.otp_required_for_login = false if options[:disable_2fa]
+      user.webauthn_credentials = [] if options[:disable_2fa]
 
       if user.save
         user.confirm if options[:confirm]