rpc server: fix subscription id_provider being reset to default one. (#6588)

# Description

The PR ensures that the id_provider variable is cloned instead of taken,
which can help prevent issues related id provider being reset to the
default.

In [a test in
moonbeam](https://github.com/moonbeam-foundation/moonbeam/blob/c6d07d703dfcdd94cc311fa83b553071b7d433ff/test/suites/dev/moonbase/test-subscription/test-subscription.ts#L20-L31)
we found that the id_provider is being reset somehow and changed to the
default one. Changing .take() to .clone() would fix the issue.


# Checklist

* [x] My PR includes a detailed description as outlined in the
"Description" and its two subsections above.
* [ ] My PR follows the [labeling requirements](

https://github.com/paritytech/polkadot-sdk/blob/master/docs/contributor/CONTRIBUTING.md#Process
) of this project (at minimum one label for `T` required)
* External contributors: ask maintainers to put the right label on your
PR.
* [ ] I have made corresponding changes to the documentation (if
applicable)
* [ ] I have added tests that prove my fix is effective or that my
feature works (if applicable)

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Co-authored-by: Niklas Adolfsson <[email protected]>