Primitive Render Mode has bad enum name and tooltip

There is an extra option for the Planar Reflections with the Primitive Render Mode that appears to have the tooltip legacy. This issue does not appear to be a regression.

Versions Tested: Issue occurs in all versions tested
4.18.3 CL - 3832480
4.17.2 CL - 3658906
4.19p1 CL - 3837072

1. create a new project ( no template or starter content needed)
2. add a planar reflection to the level'
3. in the details panel under the "Primitive Render" option and click the drop-down menu
   Result: there are two options for Render Scene Primitive with different tooltips
   Expected result: there is only one option for Render Scene Primitives