Fix PowerLevelsEventContent is defined but never used.

Draupnir\packages\matrix-protection-suite\src\Protection\ProtectionHandles.test.ts
  10:10  error  'PowerLevelsEventContent' is defined but never used  @typescript-eslint/no-unused-vars

Author: FSG-Cat

packages/matrix-protection-suite/src/Protection/ProtectionHandles.test.ts

@@ -7,7 +7,6 @@ import { PowerLevelPermission } from "../Client/PowerLevelsMirror";
 import { StandardConfigDescription } from "../Config/ConfigDescription";
 import { Ok, isError } from "../Interface/Action";
 import { Logger } from "../Logging/Logger";
-import { PowerLevelsEventContent } from "../MatrixTypes/PowerLevels";
 import { Membership } from "../Membership/MembershipChange";
 import {
   describeProtectedRoomsSet,