feat(net): optimize validSignature function

[xxo1shine]

What does this PR do?
optimize validSignature function

Why are these changes required?

This PR has been tested by:

• Unit Tests
• Manual Testing

Follow up

Extra details

[codecov-commenter]

Codecov Report

Merging #5159 (9d5d0e0) into release_v4.7.2 (0a3f2aa) will increase coverage by 0.00%.
The diff coverage is 0.00%.

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@@                Coverage Diff                @@
##             release_v4.7.2    #5159   +/-   ##
=================================================
  Coverage             55.81%   55.82%           
- Complexity             8357     8361    +4     
=================================================
  Files                   836      836           
  Lines                 49592    49593    +1     
  Branches               5517     5518    +1     
=================================================
+ Hits                  27682    27684    +2     
  Misses                19693    19693           
+ Partials               2217     2216    -1     

Impacted Files	Coverage Δ
...c/main/java/org/tron/core/net/TronNetDelegate.java	41.26% <0.00%> (-0.34%)	⬇️

... and 2 files with indirect coverage changes

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