[rpc-alt] respect configured dynamic-fields page sizes

[emmazzz]

Description

I noticed the page size config for dynamic fields is superseded by object config. This PR fixes that.

Test plan

Locally checked that the config now works.

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Release notes

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• [ ] Protocol:
• [ ] Nodes (Validators and Full nodes):
• [ ] gRPC:
• [ ] JSON-RPC:
• [ ] GraphQL:
• [ ] CLI:
• [ ] Rust SDK:

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[amnn]

@emmazzz this should still be relevant, right?