Fix build warning reported by gcc-9.2.0.

[KineticTheory]

Background

• A recent change to SortPermutation.hh to fix LLVM build issues, introduced a gcc build warning.

Purpose of Pull Request

• fixes gcc-9.2 complains about SortPermutation.hh #828

Description of changes

• Add noexcept to the copy constructor.

Status

• Reference:
  • Pre-Merge Code Review
  • CDash Status
• Checks
  • Travis/Appveyor CI checks pass
  • Code coverage does not decrease
  • Valgrind test passes
  • Toss3 checks pass
  • Trinitite checks pass
  • Code reviewed/approved, sufficient DbC checks, testing, documentation

[codecov]

Codecov Report

Merging #829 into develop will not change coverage.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##           develop    #829   +/-   ##
=======================================
  Coverage     94.2%   94.2%           
=======================================
  Files          367     367           
  Lines        17260   17260           
=======================================
  Hits         16264   16264           
  Misses         996     996