fix: Expose not working correctly with toClassOnly

[kpiatkowski]

Description

I have data that is incoming from 3rd party provider, and I need to transform properties to my internal structure and be able to export it that way too. Basically I just need to transform keys while importing.

class TestClass {
  @Expose({ name: "Test", toClassOnly: true })
  public test: string;
}

const instance = plainToInstance(TestClass, { Test: "something" });
const plain = instanceToPlain(instance);

console.log(instance);
console.log(plain);

Expected behavior

TestClass { test: 'something' }
{ test: 'something' }

Actual behavior

TestClass { test: 'something' }
{ Test: 'something' }

[diffy0712]

Duplicate of #1324

[github-actions]

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