Remote SFTP Download modifies remoteFile String when using a build parameter

### Jenkins and plugins versions report

Environment

Jenkins: 2.440.3
OS: Windows Server 2016 - 10.0
Java: 11.0.21 - Eclipse Adoptium (OpenJDK 64-Bit Server VM)
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### What Operating System are you using (both controller, and any agents involved in the problem)?

Windows Server 2016

### Reproduction steps

1. Create a Jenkins Freestyle project
2. Add Remote SFTP Download
3. Select Target Server
4. Enter remoteFile: `/data/workorders/${WORK_ORDER}/file.txt`
5. Enter localFolder: `C:\Temp`
6. Enter fileName: `file.txt`
7. Save Configuration
8. Run job

### Expected Results

When I execute this job the first time, SSH2Easy resolves the Jenkins build parameter `${WORK_ORDER}` to the user supplied value and uses it in the string to locate the folder on the remote system. Each time I run the job the `${WORK_ORDER}` should be evaluated and I can look in different folders as needed like the following:

- `/data/workorders/WO1/file.txt`
- `/data/workorders/WO2/file.txt`
- `/data/workorders/WO3/file.txt`

### Actual Results

What actually happens, SSH2Easy resolves the Jenkins build parameter `${WORK_ORDER}` the first time and saves it in the remoteFile input field. Now the remoteFile has this value `/data/workorders/WO123456789/file.txt` and I am not able to use the build parameter as expected.

### Anything else?

Please update the logic to not save the build parameter and leave the string text alone so this plugin can use the build parameters as they are intended to be used.

### Are you interested in contributing a fix?

Maybe