New checklist icons not rendered when printing from iOS

#### Steps to reproduce
1. Add checklists to your note
2. Tap the "Exclamation point" icon in the upper right of the note
3. Tap the "Send" button
4. Tap "Print"

#### What I expected
I expected the nice checklist icons in the note to be rendered when printing the note.

#### What happened instead
The checklist prints as:

\- [x] Checked Item 1
\- [x] Checked Item 2
\- [ ] Unchecked Item 3

#### Simplenote version
iOS 4.6.8

#### iOS version
12.1.3

The checklists are rendered when printed using the latest macOS version of Simplenote.

Reproduce the issue using Simplenote iOS 4.6.8 on iOS 12.1.3 by adding a checklist and printing it through the note's Exclamation point and Send actions. Trace the iOS print flow and compare its output with the macOS version; done means checked and unchecked checklist icons render in the printed note instead of Markdown-style markers.

Written by the indexing model from the issue text.