Extension does not respect stable-diffusion-webui --data-dir option

[ryanwalder]

Describe the bug

Extension looks in $installDir for data, not $dataDir. This leads to file not found errors because the extrension is checking the wrong location.

To Reproduce

1. Install table-diffusion-webui webui
   • EG: /home/foobar/webui
2. Launch table-diffusion-webui with --data-dir /tmp
3. Install this extension
4. Restart as normal
5. Try to generate face model
   1. FaceSwapLap tab
   2. Build tab
   3. Add photos
   4. [Save]
   5. Check console, build fails with error:
      • FaceSwapLab - ERROR - Failed to build checkpoint [Errno 2] No such file or directory: '/home/foo/stable-diffusion-webui/extensions/sd-webui-faceswaplab/references/woman.png'
   6. Should be looking in /tmp/extensions/sd-webui-faceswaplab/references/woman.png

This can also be see with the location of the inswapper_128.onnx file being /home/foo/stable-diffusion-webui/models not /tmp/models

Note: /tmp only used as an example, not my actual data dir.

Expected behavior

Look in correct install location/data-dir

Desktop (please complete the following information):

• OS: linux (debian)
• Browser: FF/Chrome
• Version: latest