Extension breaks under https

When webui is served under https, the extension no longer works due to some resources being loaded over http. 

Error from console:
```
Blocked loading mixed active content “http://sd.ai.localnet/sd-webui-comfyui/comfyui/?workflowTypeId=sandbox_tab&webuiClientId=efc86f56-99f2-411d-8f73-15f2eaf6f793
```

The resource should be loaded in whichever scheme the parent frame is using.