Return to view mode after annotation save

[Hopding]

Description

After the user saves an edited annotation, return to the view mode for that annotation.

Motivation and Context

Fixes #569.

Checklist:

• [x] My code follows the code style of this project.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

Browsers

• [ ] Chrome
• [x] Firefox
• [ ] Safari
• [ ] Mobile:
• [ ] Other: