fix[rn_inspector.ts]: remove nonexistent import

# Summary

Accidentally added in #10

# Test plan

N / A

# Upstreaming plan

<!-- Pick one: -->

- [ ] This commit should be sent as a patch to the upstream `devtools-frontend` repo. I've reviewed the [contribution guide](https://docs.google.com/document/d/1WNF-KqRSzPLUUfZqQG5AFeU_Ll8TfWYcJasa_XGf7ro/edit#heading=h.9kj7femz1xg5).
- [x] This commit is React Native-specific and cannot be upstreamed.

front_end/entrypoints/rn_inspector/rn_inspector.ts

@@ -13,7 +13,6 @@ import '../../panels/mobile_throttling/mobile_throttling-meta.js';
 import '../../panels/network/network-meta.js';
 import '../../panels/js_profiler/js_profiler-meta.js';
 import '../../panels/rn_welcome/rn_welcome-meta.js';
-import '../../panels/react_devtools/react_devtools-meta.js';
 
 import * as Root from '../../core/root/root.js';
 import * as Main from '../main/main.js';