Fix pre download

[Hitenjain14]

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 #1222 (18d3427) into sprint-1.10 (090e715) will not change coverage. The diff coverage is n/a.

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@@             Coverage Diff              @@
##           sprint-1.10    #1222   +/-   ##
============================================
  Coverage        25.53%   25.53%           
============================================
  Files               83       83           
  Lines             9353     9353           
============================================
  Hits              2388     2388           
  Misses            6668     6668           
  Partials           297      297           

Flag	Coverage Δ
Unit-Tests	25.53% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
...in.net/blobbercore/allocation/file_changer_base.go	45.23% <ø> (ø)
code/go/0chain.net/blobbercore/reference/ref.go	0.00% <ø> (ø)