Text editor does not respond to form reset events.

**Describe the bug**
A when a textarea is in a form, and the form is reseted, then the textarea should reset to its initial value.

This does not occur with EasyMDE.

**To Reproduce**
Steps to reproduce the behavior:
1. https://stackblitz.com/edit/easymde-tfreno/?file=index.html
2. Click the second form reset, note that it resets to it's initial state.
3. Click the first form reset, note that it does not reset.

**Expected behavior**
EasyMDE textareas within a form should respond to reset events.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Version information**
- OS: [e.g. Windows, MacOS]
- Browser: [e.g. Chrome 72]
- EasyMDE version: [e.g. 2.5.1]

**Additional context**
This issue https://github.com/Ionaru/easy-markdown-editor/issues/558 also relates to reset events, but these are not duplicates.