chore(fmt): restore rustfmt on aisix-etcd loader test (post-#362)

[moonming]

Summary

PR #362 added fn provider_key_happy_path_accepts() with a multi-line vec! initializer that rustfmt collapses to a single line. main has been failing lint (fmt + clippy) on every PR since #362 merged (e.g. ai-gateway#360's run shows the diff at crates/aisix-etcd/src/loader.rs:445).

This is a pure 1-line fmt restore — no logic change.

Verification

• cargo fmt --all -- --check clean locally on this branch (matches the CI command in .github/workflows/ci.yml).
• Toolchain: rustc 1.93.1 (pinned via rust-toolchain.toml), rustfmt 1.8.0-stable.

Why a separate PR

Surfaced while debugging CI on ai-gateway#360 (the AISIX-Cloud#410 fix). Keeping this isolated from #360 per surgical-changes discipline — #360 doesn't touch loader.rs.

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⚙️ Run configuration

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Run ID: 785eb7c4-4862-4105-b525-f015024be76e

📥 Commits

Reviewing files that changed from the base of the PR and between 8d68d31 and 6b76e09.

📒 Files selected for processing (1)

• crates/aisix-etcd/src/loader.rs

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[Copilot]

Pull request overview

Restores rustfmt-compliant formatting in the aisix-etcd loader unit tests to stop cargo fmt --check from failing CI after PR #362 introduced a multi-line vec! initializer that rustfmt collapses.

Changes:

• Reformat provider_key_happy_path_accepts test to match rustfmt output (no behavioral changes).

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