Change inaccurate wording for DNS providers

[ghost]

Changes proposed in this PR:

• Change "Based on server choice" to "Based on user configuration"

https://discuss.privacyguides.net/t/clarify-the-nextdns-filtering/12360

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[privacyguides-bot]

This pull request has been mentioned on Privacy Guides. There might be relevant details there:

https://discuss.privacyguides.net/t/v3-10/12551/1