Added .description so onAdEvent returns a string

[edougher]

What does this Pull Request do?

This fixes the onAdEvent in the native iOS codebase. It does this by adding .description to the argument so that a string is passed to the RN wrapper. Example:

onAdEvent?(["client": event.client.description, "type": event.type.description])

Why is this Pull Request needed?

When logging the onAdEvent on an iOS device the event was logging null for client and type. For example:

onAdEvent {"client": null, "target": 187, "type": null}

After the fix, the log now looks like this:

onAdEvent {"client": "googima", "target": 187, "type": "request"}

Are there any points in the code the reviewer needs to double check?

No

Are there any Pull Requests open in other repos which need to be merged with this?

No

Addresses Issue(s):

GitHub Issue

[Jmilham21]

Good catch.