fix delete grayscale item cluster mismatch issue

[nobodyiam]

No description provided.

[codecov-io]

Codecov Report

Merging #2639 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2639      +/-   ##
============================================
+ Coverage     50.22%   50.23%   +<.01%     
- Complexity     2060     2061       +1     
============================================
  Files           413      413              
  Lines         12647    12647              
  Branches       1294     1294              
============================================
+ Hits           6352     6353       +1     
  Misses         5845     5845              
+ Partials        450      449       -1

Impacted Files	Coverage Δ	Complexity Δ
.../apollo/internals/RemoteConfigLongPollService.java	80.24% <0%> (+0.61%)	28% <0%> (+1%)	⬆️

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[coveralls]

Coverage remained the same at 53.784% when pulling c3e18cf on nobodyiam:fix-delete-grayscale-item into 7929a93 on ctripcorp:master.