Niagara Parameter Reference Counts do not include Renderer bindings

Renderer bindings aren't being accounted for in a parameter's reference count.

1. Create a Niagara system based on the fountain emitter
2. Add a user parameter for a Material Interface
3. Change the Renderer's Material User Param Binding to the newly created parameter
4. Compile and save

RESULT

The reference count next to the material user parameter in the parameter panel will remain 0, which can mislead the user to thinking the parameter is unused.