fixed readonly wrapper

[dabasov]

Changes

Fixes

Tests

Tasks to complete before merging PR:

• [ ] Ensure system tests are passing. If not Run them manually to check for any regressions :clipboard:
• [ ] Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• [ ] Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• 0chain:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

Codecov Report

Merging #1261 (332ca67) into staging (c506cf6) will not change coverage. The diff coverage is n/a.

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@@           Coverage Diff            @@
##           staging    #1261   +/-   ##
========================================
  Coverage    25.48%   25.48%           
========================================
  Files           83       83           
  Lines         9365     9365           
========================================
  Hits          2387     2387           
  Misses        6682     6682           
  Partials       296      296           

Flag	Coverage Δ
Unit-Tests	25.48% <ø> (ø)

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