Checkins: "x" to remove selection on current date prevents information from saving and greys out buttons

How it works now

• When trying to remove a Condition, Symptom, or Treatment, clicking the "x" next to a selection on the current date prevents information from saving (the selection removal and toggling a selection on/off) and greys out the "Add a ____", "Back", and "Next" buttons
• This gives three console errors:

1. Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://flaredown-api.herokuapp.com/api/trackings/955694. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing). [Learn More]

2. Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://flaredown-api.herokuapp.com/api/trackings/955694. (Reason: CORS request did not succeed). [Learn More]

3. The adapter operation was aborted

• Trying to remove a Condition, Symptom, or Treatment on a prior day does not cause the same errors

How it should work
Users should be able to remove a Condition, Symptom, or Treatment, with no issues.

No source file or test is named. Start by reproducing removal on the current date and inspect the request to /api/trackings/955694 alongside the reported CORS and aborted-operation errors; compare it with removal on a prior day. Done means current-date selections can be removed or toggled without errors, and the Add, Back, and Next buttons remain usable.