Ticking "Omit year" for contact birthday shows 1900 as the year in the edit box

[provokateurin]

Describe the bug

Steps to reproduce

1. Create a new contact
2. Add the birthday information
3. Click "Omit year"

Expected behavior

No year should be displayed

Actual behavior

1900 is shown

Contact version

c.nc.c

Operating system

No response

PHP engine version

None

Web server

None

Database

None

Additional info

Follow-up to #4179