rmxpert example is failing after pyaedt#5488

### deployment template

other (please specify in the description)

### Bug description

Changes in https://github.com/ansys/pyaedt/pull/5488 made rmxpert example due to a property renaming.

### Expected Behavior

Passing example

### Steps to reproduce

_No response_

### Relevant log output

```shell

```

Locate the rmxpert example in this repository and compare its property usage with the renaming introduced by pyaedt#5488. Update the example so it runs successfully, then run the example to confirm the expected passing behavior.

Written by the indexing model from the issue text.