Fix last ID not saving when using --json

toot/cli/post.py

@@ -184,10 +184,11 @@ def post(
         poll_hide_totals=poll_hide_totals,
     )
 
+    status = response.json()
+
     if json:
         click.echo(response.text)
     else:
-        status = response.json()
         if "scheduled_at" in status:
             scheduled_at = parse_datetime(status["scheduled_at"])
             scheduled_at = datetime.strftime(scheduled_at, "%Y-%m-%d %H:%M:%S%z")