drafts: Avoid accidental draft deletions.
drafts: Avoid accidental draft deletions.

We no longer delete existing drafts if you happen
to clear the text in your compose box for a message
that was restored from an existing draft.  This
prevents folks from losing drafts when they accidentally
delete selected text.

There are still two ways to delete a draft:

    * send the message (obviously not always desirable)
    * use the drafts UI (with `d` as a shortcut to bring it up)

See https://chat.zulip.org/#narrow/stream/9-issues/topic/lost.20draft
for more discussion.

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