Hotfix: Retain login form data across admin data updates

[benloh]

Fixes #23

Fixes bug where login form input field will reset if there are admin data updates, e.g. add new prop.

To Test

1. On the first computer on a login screen and enter some text (without hitting Enter)
2. On second computer, login and create a new model
3. On the second computer, add a new prop/mech/outcome.
4. As soon as the prop is added, the login screen on the first computer refreshes. The login should be retained and not cleared.

[benloh]

@Sakelun I think this should address the login reset problem. Please let me know if it doesn't.
Please assign back to me to merge.