Remove default plugin entrypoints for hot-reloading

Summary: As we stopped bundling plugins in D39276249, we no longer need the entry points for the bundled plugins (these entry points are always going to be empty)

Reviewed By: lblasa

Differential Revision: D39307565

fbshipit-source-id: 43751fe31c8bd962677c226b27cfe52093d3f2d4

desktop/flipper-frontend-core/src/RenderHost.tsx

@@ -138,7 +138,6 @@ export interface RenderHost {
   shouldUseDarkColors(): boolean;
   restartFlipper(update?: boolean): void;
   openLink(url: string): void;
-  loadDefaultPlugins(): Record<string, any>;
   GK(gatekeeper: string): boolean;
   flipperServer: FlipperServer;
   serverConfig: FlipperServerConfig;