Fix duplicate blobber alloc removing

[peterlimg]

Fixes

• closes Could not remove allocation from blobber #2256

Changes

Need to be mentioned in CHANGELOG.md?

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• 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):

• blobber:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

Codecov Report

Merging #2264 (a1f1928) into staging (6a4691f) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

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@@             Coverage Diff             @@
##           staging    #2264      +/-   ##
===========================================
- Coverage    29.30%   29.29%   -0.01%     
===========================================
  Files          377      377              
  Lines        62549    62549              
===========================================
- Hits         18328    18322       -6     
- Misses       42065    42075      +10     
+ Partials      2156     2152       -4     

Flag	Coverage Δ
Unit-Tests	29.29% <0.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...go/0chain.net/smartcontract/storagesc/challenge.go	35.15% <0.00%> (ø)

... and 2 files with indirect coverage changes

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[dabasov]

lgtm

[service-0chain]

Manual system tests [failure] with the following config

config	value
tests skipped	FALSE
system-tests	420-system-tests-for-global-historic-metrics-for-graphs
gosdk	staging
zboxcli	staging
zwalletcli	staging
0chain	staging
blobber	staging
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	master
0proxy	staging
0search	staging