counsel-rg fails on tramp-connected remote servers

### What did you expect to happen?

counsel-rg on a remote server (via tramp) should work if rg is installed on the remote server.

### What actually happened?

counsel-rg on a remote server (via tramp) does not work even if rg is installed on the remote server.

\*Messages\* buffer:

```
Debug on Error enabled globally
user-error: Required program "rg" not found in your path
```

`debug-on-error` does not produce a stacktrace.

### Describe your attempts to resolve the issue

Sorry, I don't know enough about emacs to know how to approach this problem.

I did find a similar bug report at https://github.com/abo-abo/swiper/issues/2160, though.

### Steps to reproduce

1. Connect to remote server via tramp
2. Run M-x counsel-rg

### System Information

https://pastebin.com/GEWr7ieZ