HRO-Cloud: Fix deployment warnings

The HRO-Cloud uses some outdated nix options:

From https://whetstone.private.storage/privatestorage/PrivateStorageio/-/jobs/23022

• trace: warning: The option nix.autoOptimiseStore' defined in /nix/store/2vxiavy4icprsh961rf1x3b08vw5k8mr-morph-1.7.0-lib/eval-machines.nix' has been renamed to `nix.settings.auto-optimise-store'.
• trace: warning: The option nix.maxJobs' defined in /home/deployment/PrivateStorageio/morph/grid/hro-cloud/storage001-hardware.nix' has been renamed to `nix.settings.max-jobs'.