Installer not actually backing up AI models when choosing Yes at back up models option at uninstallation

## Describe the bug

When uninstalling or reinstalling AL Playground, the installer will prompt to save a copy of current AI models, however, the "AI Playground_model_backup" folder will only have "llm" and "stable_diffusion" sub-folders which doesn't fully backup all your downloaded models. I assume this is not supposed behavior.

## To Reproduce

Steps to reproduce the behavior:
1. Download some models (dreamshaper-8, Juggernaut-XL-v9, etc.).
2. uninstall/reinstall AI playground.
3. Click Yes when prompted to back up models.
4. Go to AI Playground_model_backup folder, and none of your downloaded model will be there.

## Expected behavior

At above step 4, your downloaded models will be backup'ed. Preferably ComfyUI should also get a backup since it's a pain to download everything in China (there is no proxy setting in AI Playground control...not sure if I should open a feature request).

## Environment (please complete the following information):

- OS: [Windows 10 22H2 Build 19045.5247]
- GPU: [Intel Arc A770 16G]

## Additional context
This is a problem I encounter when I tried to reinstall AI Playground due to a ls_level_zero.exe error prompt. The supposed executable directory the prompt gives me is "AI Playground\resources\ai-backend-env\Library\bin\ls_level_zero.exe" but I can't find anything there, so I reinstalled AI Playground and every model is lost.