Attachment preview breaks because `handleAttachmentPreview` is undefined

Did you use the FAQ section?

• Yes, I have read [the FAQ](https://github.com/PrivateBin/PrivateBin/wiki/FAQ) and I found no solution/answer there.

Adding a file while the editor is already in preview mode triggers a JavaScript error because an undefined method is called.

Steps to reproduce

1. Open PrivateBin.
2. Switch the editor to preview mode.
3. Attach a file.

What happens

The browser console reports a TypeError because handleAttachmentPreview is not defined, and the attachment preview is not displayed.

The affected call is in js/privatebin.js:

me.handleAttachmentPreview($attachmentPreview, dataURL);

However, the defined method appears to be:

me.handleBlobAttachmentPreview($targetElement, blobUrl, mimeType)

What should happen

The attachment preview should be rendered without a JavaScript error.

Additional information

The upload data itself still appears to be stored in attachmentsData; the issue is limited to preview rendering.

Relevant file:

• js/privatebin.js

Basic information

Server address: Local development instance

Server OS: macOS / local development environment

Webserver: PHP CLI / local test environment

Browser: Reproducible in browser with developer console open

PrivateBin version: 2.0.5 / master

I can reproduce this issue on https://privatebin.net/: Yes