[ML] Anomaly Explorer - invalid syntax after removing 2nd of 3 filters via button

[pheyos]

Found in version

• 8.0.0 b4544

Browser

• Chrome

Steps to reproduce

• In the anomaly explorer add 3 influencer filters via the + button in the anomaly list
• Remove the second filter via the - button in the anomaly list

Expected result

• The second filter is removed and the remaining filters are working

Actual result

• The filter itself is removed, but the logical operators are not, such that the remaining filter expression is invalid:
  

Additional information

• Removing the first or the last of the filters works fine

[elasticmachine]

Pinging @elastic/ml-ui