Fix double field in CloudBlobMetadata serializer

[lightningrob]

Fixes AzureIntegration test.

[codecov-io]

Codecov Report

Merging #1376 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1376      +/-   ##
============================================
+ Coverage     72.06%   72.08%   +0.01%     
- Complexity     6789     6802      +13     
============================================
  Files           489      489              
  Lines         38475    38547      +72     
  Branches       4891     4906      +15     
============================================
+ Hits          27728    27786      +58     
- Misses         9417     9420       +3     
- Partials       1330     1341      +11

Impacted Files	Coverage Δ	Complexity Δ
...java/com.github.ambry.cloud/CloudBlobMetadata.java	89.74% <ø> (-0.09%)	37 <0> (ø)
...hub.ambry.clustermap/AmbryPartitionStateModel.java	43.13% <0%> (-2.7%)	5% <0%> (ø)
...c/main/java/com.github.ambry.network/Selector.java	78.21% <0%> (-1.84%)	77% <0%> (-2%)
...java/com.github.ambry.store/CompactionManager.java	90.47% <0%> (-1.79%)	25% <0%> (ø)
...java/com.github.ambry.network/SSLTransmission.java	70.46% <0%> (-1.54%)	76% <0%> (-1%)
.../java/com.github.ambry.router/DeleteOperation.java	93.43% <0%> (-1.46%)	44% <0%> (-1%)
...github.ambry.rest/AsyncRequestResponseHandler.java	86.86% <0%> (-1.02%)	21% <0%> (ø)
.../com.github.ambry.clustermap/HelixParticipant.java	84.61% <0%> (-0.94%)	58% <0%> (+2%)
...ry.replication/CloudToStoreReplicationManager.java	50.98% <0%> (-0.68%)	10% <0%> (ø)
...ain/java/com.github.ambry.router/PutOperation.java	91.23% <0%> (-0.5%)	114% <0%> (-1%)
... and 15 more

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