[hotfix] get public channel

src/controllers/channels/dto.ts

src/controllers/public-controller.ts

src/services/channels-service.ts

src/services/impl/channels-service-impl.ts

src/services/impl/channels/find-all-channels.ts

src/services/impl/channels/find-channel-by-id.ts

src/services/impl/channels/find-public-channel-by-id.ts

src/services/impl/channels/find-public-channels.ts