smartcontract/cli: fix stale multicast device field names in tests

[ben-dz]

Summary of Changes

• Replace removed multicast_users_count and max_multicast_users fields with multicast_subscribers_count/multicast_publishers_count and max_multicast_subscribers/max_multicast_publishers in CLI test Device struct literals, fixing the compilation break introduced by smartcontract: split multicast user tracking into publisher and subscriber counters #3234

Diff Breakdown

Category	Files	Lines (+/-)	Net
Tests	4	+24 / -12	+12

Pure test fix — all changes are in test code updating struct field names.

Key files (click to expand)

• smartcontract/cli/src/device/interface/create.rs — update 2 test Device literals (2 occurrences)
• smartcontract/cli/src/link/wan_create.rs — update 2 test Device literals (2 occurrences)
• smartcontract/cli/src/device/interface/update.rs — update 1 test Device literal
• smartcontract/cli/src/link/dzx_create.rs — update 1 test Device literal

Testing Verification

• make rust-lint passes cleanly
• All 263 CLI tests and 147 SDK tests pass