Command+Enter should also work when editing a comment

Overview

Currently you can use Command+Enter to save a new comment. However when editing an existing comment updates are auto-saved so there is no save action. The hard part is that once you build a habit of using the keyboard shortcut you want it to work when editing as well.

Potential solution

When editing an existing comment we should use Command+Enter to stop editing. This would essentially become a way to use the keyboard shortcut to say "I am done editing this comment."