Bug with the full module

### 🔍 Before submitting the issue

- [X] I have searched among the existing issues
- [X] I am using a Python virtual environment

### 🐞 Description of the bug

Hello,
When I open a file.full and I try to get the unsorted dof_ref using full.load_km(sort=False), I get an array that indicates that I have only one dof (dof = 0) for each nodes. But my simulation is a vibroacoustic one so I should have 4 dofs per nodes.
Thank you,
Raphaël.

### 📝 Steps to reproduce

-

### 💻 Which operating system are you using?

Windows

### 📀 Which ANSYS version are you using?

2023R2

### 🐍 Which Python version are you using?

3.10

### 📦 Installed packages

```shell
I installed it via the command : pip install ansys-mapdl-core
```

Start by reproducing the issue with an ANSYS 2023R2 .full file and full.load_km(sort=False), then inspect the returned dof_ref values for a vibroacoustic simulation. Compare the reported degrees of freedom with the expected four per node; the issue is done when unsorted dof_ref correctly represents those degrees of freedom.

Written by the indexing model from the issue text.