fix typo in twitter section

[d0zingcat]

Looks like there's a typo in the tweet processing section. If I configure it like this:

version: '3.8'
services:
  crossposter:
    build: .
    environment:
      BSKY_HANDLE: d0zingcat.bsky.social
      BSKY_PASSWORD: xxx
      MASTODON_HANDLE: d0zingcat
      MASTODON_INSTANCE: mastodon.social
      MASTODON_TOKEN: xxx
      TWITTER_APP_KEY:
      TWITTER_APP_SECRET:
      TWITTER_ACCESS_TOKEN:
      TWITTER_ACCESS_TOKEN_SECRET:
      # I don't want to post to twitter
      TWITTER_CROSSPOSTING: false
      # only post to mastodon 
      MASTODON_CROSSPOSTING: true
      LOG_LEVEL:
      MASTODON_VISIBILITY:
      MENTIONS:
      POST_DEFAULT:
      MASTODON_LANG:
      TWITTER_LANG:
      QUOTE_POSTS:
      MAX_RETRIES:
      POST_TIME_LIMIT:
      MAX_PER_HOUR:
      OVERFLOW_POST:
      RUN_INTERVAL: 3600
    volumes:
      - ./db:/db
      - ./backup:/backup

This means I don't want to sync to Twitter and just want to sync the posts to Mastodon. The "skipped" toot_id would cause all Mastodon posts to be skipped.

[d0zingcat]

PS, sorry for my neovim auto formatter 😆