[Mobile] Don't move DOM nodes

[VWoeltjen]

When including/excluding a DOM element via mct-device,
use replaceWith() instead of parent().append() to preserve
original ordering of DOM elements from template.
#213.

[VWoeltjen]

Author Checklist

1. Changes address original issue? Y
2. Unit tests included and/or updated with changes? Y
3. Command line build passes? Y
4. Expect to pass code review? Y

[akhenry]

Looks good to me.

Reviewer Checklist

• Changes appear to address issue? Y
• Appropriate unit tests included? Y
• Code style and in-line documentation are appropriate? Y
• Commit messages meet standards? Y