feat(stake2.0): optimize code, remove useless code

[CarlChaoCarl]

What does this PR do?
remove useless code in Stake 2.0

Why are these changes required?

This PR has been tested by:

• Unit Tests
• Manual Testing

Follow up

Extra details

[codecov-commenter]

Codecov Report

Merging #4997 (15b36cc) into release_v4.7.1 (50ad05a) will increase coverage by 0.03%.
The diff coverage is n/a.

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@@                 Coverage Diff                  @@
##             release_v4.7.1    #4997      +/-   ##
====================================================
+ Coverage             54.70%   54.74%   +0.03%     
- Complexity             8220     8226       +6     
====================================================
  Files                   841      841              
  Lines                 49702    49697       -5     
  Branches               5456     5456              
====================================================
+ Hits                  27191    27205      +14     
+ Misses                20369    20350      -19     
  Partials               2142     2142              

Impacted Files	Coverage Δ
...ices/http/solidity/SolidityNodeHttpApiService.java	4.16% <ø> (+0.27%)	⬆️
.../java/org/tron/core/consensus/BlockHandleImpl.java	65.00% <0.00%> (-15.00%)	⬇️
...rc/main/java/org/tron/consensus/dpos/DposTask.java	87.09% <0.00%> (-3.23%)	⬇️
framework/src/main/java/org/tron/core/Wallet.java	37.32% <0.00%> (-0.04%)	⬇️
...java/org/tron/core/capsule/TransactionCapsule.java	52.68% <0.00%> (+0.23%)	⬆️
...ork/src/main/java/org/tron/core/trie/TrieImpl.java	58.24% <0.00%> (+0.35%)	⬆️
...mework/src/main/java/org/tron/core/db/Manager.java	53.76% <0.00%> (+0.67%)	⬆️
...g/tron/core/capsule/utils/FastByteComparisons.java	68.00% <0.00%> (+4.00%)	⬆️
...src/main/java/org/tron/core/db/PendingManager.java	51.16% <0.00%> (+16.27%)	⬆️

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