ZTS: Fix zfs_send_delegation_user test

[behlendorf]

Motivation and Context

  Warning: TestGroup '/var/tmp/tests/functional/cli_root/zfs_send_delegation_user' not added to this run. Auxiliary script '/var/tmp/tests/functional/cli_root/zfs_send_delegation_user/setup' failed verification.

https://github.com/openzfs/zfs/actions/runs/17686430319/job/50272200621?pr=17736

Description

Correct the path in the common.run file. The zfs_send_delegation_user test is installed under cli_user not cli_root.

How Has This Been Tested?

Will be verified by the CI. We should also consider making the verification warnings fatal when run by the CI.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Quality assurance (non-breaking change which makes the code more robust against bugs)
• Breaking change (fix or feature that would cause existing functionality to change)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• Documentation (a change to man pages or other documentation)

[behlendorf]

cc: @allanjude