Empty MathML namespace elements are not generated as self closing in engine-server

[jhefferman-sfdc]

Description

Steps to Reproduce

Render the following markup using @lwc/engine-server:

<math>
   <plus></plus>
   <plus/>
</math>

Expected Results

The void plus elements should be rendered as self closing

<math>
   <plus/>
   <plus/>
</math>

Actual Results

The void plus elements are rendered with closing tags

<math>
   <plus></plus>
   <plus></plus>
</math>

[git2gus[bot]]

This issue has been linked to a new work item: W-17395920