X'ing out post w/ failed media publishes post

[meremagee]

When you cancel a post that has any failed media items, you get the "save anyway" alert. Clicking "save anyway" to exit the post publishes the post.

repro:

• create new post
• upload several images at once
• a few of them fail if on a slower/data connex
• hit X in top left to cancel post
• get wrong alert: https://cloudup.com/ijMGNsxs-Q2 (should be discard/continue per usual)
• hit yes so that you can cancel the post
• post is published

expected behavior:

• img fails > cancel post.
• show normal slide up alert: "you have unsaved changes. discard/save draft/keep editing."
• If user taps discard > throw away recent changes and exit editor as usual.
• If user taps save draft > throw alert that some images have failed and won't be saved. options > ok, discard images/ retry failed images.
• If user taps keep editing, allow them to keep editing and retry if they'd like to.

[meremagee]

video: https://lookback.io/watch/Y5suZxN5THWMJwdC5

[meremagee]

Looks awesome. Great work, @SergioEstevao!