[Bug]: Unable to disable Extensions

Nobody has claimed this yet.

### Checklist

- [ ] The issue exists after disabling all extensions
- [ ] The issue exists on a clean installation of webui
- [ ] The issue is caused by an extension, but I believe it is caused by a bug in the webui
- [X] The issue exists in the current version of the webui
- [ ] The issue has not been reported before recently
- [ ] The issue has been reported before but has not been fixed yet

### What happened?

I am trying to disable certain extensions/features to improve performance.

### Steps to reproduce the problem

Disable `sd_forge_z123` for example and select Apply and restart UI.

### What should have happened?

z123 is no longer active

### What browsers do you use to access the UI ?

Mozilla Firefox

### Sysinfo

The only bits which looks relevant is:

```
"Platform": "Linux-6.8.0-35-generic-x86_64-with-glibc2.39",
"Python": "3.10.14",
"Version": "f0.0.17v1.8.0rc-latest-276-g29be1da7",
"Commit": "29be1da7cf2b5dccfc70fbdd33eb35c56a31ffb7",

"Commandline": [
"launch.py",
"--api",
"--listen",
"--gradio-auth",
""
],
```

### Console logs

```Shell
stable-diffusion-webui-forge/modules/ui_extensions.py", line 23, in check_access
assert not shared.cmd_opts.disable_extension_access, "extension access disabled because of command line flags"
AssertionError: extension access disabled because of command line flags
```

appears on reload of the UI.
```

### Additional information

_No response_

Start in modules/ui_extensions.py at check_access and reproduce the issue by disabling sd_forge_z123, applying the change, and restarting the UI with the command-line flags shown. Trace how extension access is checked during reload; done means the selected extension is no longer active without the assertion appearing.

Written by the indexing model from the issue text.