Remove read receipts visibility client hint

This is a failed experiment that is long past its time. It needs to go.

src/d2m/actions/create-room.js

@@ -162,9 +162,6 @@ async function channelToKState(channel, guild, di) {
 			},
 			users: {...spacePower, ...globalAdminPower}
 		},
-		"chat.schildi.hide_ui/read_receipts": {
-			hidden: true
-		},
 		[`uk.half-shot.bridge/moe.cadence.ooye://discord/${guild.id}/${channel.id}`]: {
 			bridgebot: `@${reg.sender_localpart}:${reg.ooye.server_name}`,
 			protocol: {

test/data.js

@@ -48,7 +48,6 @@ module.exports = {
 					room: 0
 				}
 			},
-			"chat.schildi.hide_ui/read_receipts": {hidden: true},
 			"uk.half-shot.bridge/moe.cadence.ooye://discord/112760669178241024/112760669178241024": {
 				bridgebot: "@_ooye_bot:cadence.moe",
 				protocol: {