Fix There are no taxonomy terms matching ","

Problem/Motivation

Follow up issue after #2903968: Fix comma in string (non-delimiter) creates multiple terms
Getting the There are no taxonomy terms matching ",". warning with unlimited

Proposed resolution

Remove the "," from the beginning of the element value.

Remaining tasks

• ✅ File an issue
• ✅ Addition/Change/Update/Fix
• ✅ Testing to ensure no regression
• ➖ Automated unit testing coverage
• ➖ Automated functional testing coverage
• ➖ UX/UI designer responsibilities
• ➖ Readability
• ➖ Accessibility
• ➖ Performance
• ➖ Security
• ➖ Documentation
• ✅ Code review by maintainers
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Release notes snippet
• ✅ Release autocomplete_deluxe-2.0.5

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• Issue #3474567: Fixed There are no taxonomy terms matching ","