ENEX import via html ignores checkbox state

[msbentley]

When import an ENEX file to Joplin, the import as markdown option correctly maintains the checked status of checkboxes, whereas the html option does not.

An example ENEX file to demonstrate this is below:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE en-export SYSTEM "http://xml.evernote.com/pub/evernote-export2.dtd">
<en-export export-date="20200622T091735Z" application="Evernote/Windows" version="6.x">
<note><title>This is a note to test check-boxes in Joplin import.</title><content><![CDATA[<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE en-note SYSTEM "http://xml.evernote.com/pub/enml2.dtd">

<en-note><div>This is a note to test check-boxes in Joplin import.</div><div><en-todo checked="false"/>this is un unchecked box<br/></div><div><en-todo checked="true"/>t
his is a checked nox<br/></div><div><br/></div></en-note>]]></content> <created>20200622T091652Z</created><updated>20200622T091707Z</updated><note-attributes><author>Mark
 S. Bentley</author><source>desktop.win</source><source-application>evernote.win32</source-application></note-attributes></note></en-export>

Environment

Joplin version: 1.0.224
Platform: linux
OS specifics: ubuntu 18.04

Steps to reproduce

1. Create a note in Evernote with a checked to-do box
2. Import as MD to Joplin - checkbox state is correctly set
3. Import as HTML to Joplin - checkbox state is ignored