Fix up some more jsonb references.

apps/ssb/tf-app.js

@@ -158,7 +158,7 @@ class TfElement extends LitElement {
 	async fetch_new_message(id) {
 		let messages = await tfrpc.rpc.query(
 			`
-				SELECT messages.id, previous, author, sequence, timestamp, hash, json(content), signature
+				SELECT messages.id, previous, author, sequence, timestamp, hash, json(content) AS content, signature
 				FROM messages
 				JOIN json_each(?) AS following ON messages.author = following.value
 				WHERE messages.id = ?