todosrht-lmtp: try a bit harder to parse msg ID

Even though it is rarely used, the full format of the Message-ID header
is (grossly simplified): "Comment to be ignored <actual@message.id>",
similar to an address. Parsing this as address will still be a bit too
lax (it would accept quoted string literals on the left-id side), but
it's at least much better than the current approach.

todosrht-lmtp

@@ -177,7 +177,7 @@ class MailHandler:
         input = {
             "text": body,
             "senderId": sender.id,
-            "messageId": mail["Message-ID"].removeprefix("<").removesuffix(">"),
+            "messageId": parseaddr(mail["Message-ID"])[1],
         }
 
         cmds = ["!resolve", "!resolved", "!reopen"]