Add NoSt and ShSt diagnostic to openmp directives

- New diagnostic variables were missing from parallel openmp directive
  so caused compilation errors in the Travis-CI test
  - https://travis-ci.com/github/ocean-eddy-cpt/MOM6/jobs/372199318#L2373-L2392

src/parameterizations/lateral/MOM_hor_visc.F90

@@ -484,7 +484,7 @@ subroutine horizontal_viscosity(u, v, h, diffu, diffv, MEKE, VarMix, G, GV, US,
   !$OMP   diffu, diffv, max_diss_rate_h, max_diss_rate_q, &
   !$OMP   Kh_h, Kh_q, Ah_h, Ah_q, FrictWork, FrictWork_GME, &
   !$OMP   div_xx_h, vort_xy_q, GME_coeff_h, GME_coeff_q, &
-  !$OMP   TD, KH_u_GME, KH_v_GME &
+  !$OMP   TD, KH_u_GME, KH_v_GME, NoSt, ShSt &
   !$OMP ) &
   !$OMP private( &
   !$OMP   i, j, k, n, &