fix build error

Author: Archmonger

src/js/packages/@reactpy/client/src/index.ts

@@ -6,4 +6,4 @@ export * from "./vdom";
 export * from "./websocket";
 export { default as React } from "preact/compat";
 export { default as ReactDOM } from "preact/compat";
-export { default as preact } from "preact";
+export * as preact from "preact";