[Security Solution][Timeline] Remove field not working after removing all field

[ghost]

Describe the bug: [Timeline] Remove field not working after removing all field

Kibana/Elasticsearch Stack version

Version: SNAPSHOT
Commit: 10f61743ad0a73d3814f9d78c9dd1511e08fa195
Build: 75077

precondition

• NA

Steps to reproduce

• Navigate to Security > Timeline
• Create Timeline
• remove all field one by one ( 8 fields)
• All removed field will show up automatically
• Observed that now these field are not able to be removed

Current Result

• [Timeline] Remove field not working after removing all field

Expected Result

• [Timeline] Remove field should work correctly

Screen-cast

https://github.com/elastic/kibana/assets/59917825/276d1b7e-8208-43ee-97c7-e55aff075e4f

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)

[elasticmachine]

Pinging @elastic/security-threat-hunting (Team:Threat Hunting)

[elasticmachine]

Pinging @elastic/security-threat-hunting-investigations (Team:Threat Hunting:Investigations)