Fix API token expiration message.

[aaronweeden]

Description

Currently, if someone has an expired API token, they see:

Instead, they should see:

There is already code to do this, but it was mistakenly using the creation date of the token rather than the current time to determine if a token is expired. This PR fixes it.

Tests performed

On my port on xdmod-dev:

1. Before updating with the changes from this PR,
   1. Expire my current token manually in the database.
   2. Go to my XDMoD portal, click My Profile, and click API Token.
   3. Confirm it shows the wrong message.
2. Update my port with the changes from this PR, and repeat the same steps, confirming that it shows the right message.
3. Generate a new token, close the My Profile window, reopen it, and confirm the message is still correct.

Checklist:

• The pull request description is suitable for a Changelog entry
• The milestone is set correctly on the pull request
• The appropriate labels have been added to the pull request