fix: preserve original extension when extension redirection is disabled

[Timeless0911]

Summary

when redirect.js.extension set to false

source

export * from './bar.node';
export * from './bar.node.js';
export * from './bar.node.ts';
export * from './bar';
export * from './baz-folder';
export * from './foo.js';
export * from './foo.ts';

before

export * from "./bar.node.ts";
export * from "./bar.node.ts";
export * from "./bar.node.ts";
export * from "./baz.ts";
export * from "./baz-folder/index.ts";
export * from "./foo.ts";
export * from "./foo.ts";

now

export * from "./bar.node";
export * from "./bar.node.js";
export * from "./bar.node.ts";
export * from "./baz";
export * from "./baz-folder/index";
export * from "./foo.js";
export * from "./foo.ts";

Related Links

close: https://github.com/web-infra-dev/rslib/discussions/1368

Checklist

• [ ] Tests updated (or not required).
• [ ] Documentation updated (or not required).

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