Fix single-mode policy dropdown value

[taobojlen]

Context & Requests for Reviewers

This fixes an error from Ant design on e.g. /dashboard/manual_review/bulk-actioning and anywhere else we use PolicyDropdown:

Warning: value should not be array when TreeSelect is single mode.

We were sometimes passing an array to TreeSelect when it should be a single value.

There's no user-facing change.

Tests

Tested manually.

(Optional) Rollout Plan

N/A

Checklist

Only check items that apply to this PR; leave the rest unchecked.

• If you changed anything user-facing (i.e. user interface or APIs):
  Did you update the CHANGELOG.md and related docs?

• If you changed server/models/**/{ContentTypeModel,ActionModel,RuleModel,PolicyModel}.ts:
  Did you update the corresponding history tables and their triggers?

• If you changed db/src/scripts/** and used CREATE TABLE, ADD COLUMN, or ALTER COLUMN:
  Are as many columns marked NOT NULL as possible? If some columns can sometimes be null depending on other columns, are there CHECK constraints capturing those relationships, and are these also reflected using unions in the associated Kysely types?

• If you added a new signal in server/services/signalsService/signals/**:
  Did you classify every error case as a permanent error (SignalPermanentError, no retry) or a normal error (retryable)? Any case where the signal can't determine a score should be a SignalPermanentError.

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📥 Commits

Reviewing files that changed from the base of the PR and between 771e735 and 4512690.

📒 Files selected for processing (1)

• client/src/webpages/dashboard/components/PolicyDropdown.tsx

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