Remove redundant jQuery selector `#posts-filter input[type="submit"]`

[htdat]

Fix #664

Description

See the research on #664

Steps to Test

• Apply this PR.
• Apply the diff in the Note section in this PR https://github.com/Automattic/Edit-Flow/pull/649
• Open the browser console and watch for errors.
• Visit wp-admin > Edit Flow.
• Then visit three setting pages: Editorial Metadata, User Groups, Custom Statuses

✅ if we can change, update, and use "Quick Update" for items in these setting pages without any error.