Fixed closure serialization error when editing a webform element with ajax.

[sonnykt]

Checklist before requesting a review

• I have formatted the subject to include ticket number as [#123] Verb in past tense with dot at the end.
• I have added a link to the issue tracker
• I have provided information in Changed section about WHY something was done if this was not a normal implementation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• I have run new and existing relevant tests locally with my changes, and they passed
• I have provided screenshots, where applicable

Changed

Screenshots

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (cac5cdf) to head (c1e52b2).
Report is 1 commits behind head on 1.x.

Additional details and impacted files

@@             Coverage Diff             @@
##                 1.x       #48   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       279       279           
===========================================
  Files             16        16           
  Lines           1124      1125    +1     
===========================================
+ Hits            1124      1125    +1     

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