[ISSUE #7785] Remove the redundant code

[wyyl1]

Which Issue(s) This PR Fixes

Remove the redundant code

Fixes #7785

Brief Description

Remove the redundant code because Math.abs does not return negative numbers

How Did You Test This Change?

@Test
public void testResultOfResetIsGreaterThanOrEqualToZero() {
    ThreadLocalIndex localIndex = new ThreadLocalIndex();
    localIndex.reset();
    assertThat(localIndex.incrementAndGet() > 0).isTrue();
}

[mxsm]

LGTM

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (04eec34) 43.22% compared to head (4da51e5) 43.26%.
Report is 1 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #7784      +/-   ##
=============================================
+ Coverage      43.22%   43.26%   +0.04%     
- Complexity      9870     9881      +11     
=============================================
  Files           1173     1173              
  Lines          85034    85032       -2     
  Branches       11013    11012       -1     
=============================================
+ Hits           36752    36791      +39     
+ Misses         43717    43678      -39     
+ Partials        4565     4563       -2     

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