update-borrow-helper-v1-3

(define-data-var executed bool false)
(define-constant deployer tx-sender)

(define-public (run-update)
  (begin
    (asserts! (not (var-get executed)) (err u10))
    (asserts! (is-eq deployer tx-sender) (err u11))

    ;; enable new helper caller
    (try! (contract-call? .pool-borrow-v1-2 set-approved-contract .borrow-helper-v1-3 true))
    ;; disable old helper caller
    (try! (contract-call? .pool-borrow-v1-2 set-approved-contract .borrow-helper-v1-2 false))

    (var-set executed true)
    (ok true)
  )
)

(define-public (disable)
  (begin
    (asserts! (is-eq deployer tx-sender) (err u11))
    (ok (var-set executed true))
  )
)

(define-read-only (can-execute)
  (begin
    (asserts! (not (var-get executed)) (err u10))
    (ok (not (var-get executed)))
  )
)