When I set the SharingDelegate to a custom object, it doesn't response anymore.It looks like the delegate must be the fromviewcontroller

### Checklist before submitting a bug report

- [X] I've updated to the latest released version of the SDK
- [X] I've searched for existing [GitHub issues](https://github.com/facebook/facebook-ios-sdk/issues)
- [X] I've looked for existing answers on [Stack Overflow](https://facebook.stackoverflow.com), the [Facebook Developer Community Forum](https://developers.facebook.com/community/) and the [Facebook Developers Group](https://www.facebook.com/groups/fbdevelopers)
- [X] I've read the [Code of Conduct](https://github.com/facebook/facebook-ios-sdk/blob/main/CODE_OF_CONDUCT.md)
- [X] This issue is not security related and can safely be disclosed publicly on GitHub

### Xcode version

14.3.1

### Facebook iOS SDK version

16.1.3

### Dependency Manager

Prebuilt Binaries

### SDK Framework

Share

### Goals

I want to set a mediator as the sharingdelegate， not only the fromviewcontroller.

### Expected results

Set an object which comply with FBSDKSharingDelegate as sharingdelegate, and work fine.

### Actual results

Only set fromviewcontroller as the sharingdelegate, it works fine.when I create a mediator, and set the mediator as the sharingdelegate, I can't get any notify when I cancel a share or share successfully.

### Steps to reproduce

_No response_

### Code samples & details

```swift
import FacebookShare
import UIKit

final class ShareViewController: UITableViewController {

@IBAction func shareLink() {
guard let url = URL(string: "https://newsroom.fb.com/") else {
preconditionFailure("URL is invalid")
}

let content = ShareLinkContent()
content.contentURL = url
content.quote = "facebook test quote"
content.hashtag = Hashtag("#bestSharingSampleEver")

let sharemanager = ShareManager()
let dialog = sharemanager.dialog(withContent: content, from: self)

dialog.show()
}
}

class ShareManager: SharingDelegate {

func dialog(withContent content: SharingContent, from controller: UIViewController) -> ShareDialog {
let dialog = ShareDialog(
viewController: controller,
content: content,
delegate: self)
dialog.mode = .web

return dialog
}

func sharer(_ sharer: Sharing, didCompleteWithResults results: [String : Any]) {
print(results)
}

func sharer(_ sharer: Sharing, didFailWithError error: Error) {
print(error)
}

func sharerDidCancel(_ sharer: Sharing) {
print("Cancelled")
}
}
```