revert auth-rule check for leave

Author: sampaiodiego

packages/room/src/authorizartion-rules/rules.ts

@@ -298,9 +298,7 @@ async function isMembershipChangeAllowed(
 			// If the sender matches state_key, allow if and only if that user’s current membership state is invite or join.
 			if (
 				sender === invitee &&
-				(inviteeMembership === 'invite' ||
-					inviteeMembership === 'join' ||
-					inviteeMembership === 'leave')
+				(inviteeMembership === 'invite' || inviteeMembership === 'join')
 			) {
 				return;
 			}