fix compilation

[mtrive]

Description

Fix backwards compatibility with old versions of Unity.

[borisbauer-unity]

Seems to work well now. The change is more a clean-up: just removed one conditional line that wrote into UserPreferences.

What I expect as a user and tested:

• I select settings and they stay a persistent selection (Default or a settings asset)
• if I delete a selected settings asset while PA is closed or running it falls back onto the in-memory default settings

[mtrive]

Seems to work well now. The change is more a clean-up: just removed one conditional line that wrote into UserPreferences.

What I expect as a user and tested:

• I select settings and they stay a persistent selection (Default or a settings asset)
• if I delete a selected settings asset while PA is closed or running it falls back onto the in-memory default settings

Great, thank you!