rpc: Don't ignore
-maxtxfee when wallet is disabled
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Reviewers, this pull request conflicts with the following ones:
If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.
Please squash your commits according to https://github.com/bitcoin/bitcoin/blob/master/CONTRIBUTING.md#squashing-commits. There is no need to keep the git history around in this pull request.
Checked that it is no longer ignored when the wallet is not compiled or not enabled: