Move BIP 338 to Withdrawn

The PR implementing this BIP was never merged into Bitcoin Core,
in favor of an alternative approach.

README.mediawiki

@@ -1050,13 +1050,13 @@ Those proposing changes should consider that ultimately consent may rest with th
 | Tom Briar
 | Standard
 | Draft
-|-
+|- style="background-color: #ffcfcf"
 | [[bip-0338.mediawiki|338]]
 | Peer Services
 | Disable transaction relay message
 | Suhas Daftuar
 | Standard
-| Draft
+| Withdrawn
 |-
 | [[bip-0339.mediawiki|339]]
 | Peer Services