consistent formatting: replace "if( XXX)" with "if (XXX)"

src/KOKKOS/fix_qeq_reax_kokkos.cpp

src/KOKKOS/pair_reaxc_kokkos.cpp

src/MANYBODY/pair_comb3.cpp

src/MANYBODY/pair_lcbop.cpp

src/MISC/xdr_compat.cpp

src/MOLECULE/bond_gromos.cpp

src/MOLECULE/bond_harmonic.cpp

src/QEQ/fix_qeq.cpp

src/QEQ/fix_qeq_dynamic.cpp

src/QEQ/fix_qeq_fire.cpp

src/QEQ/fix_qeq_point.cpp

src/QEQ/fix_qeq_shielded.cpp

src/QEQ/fix_qeq_slater.cpp

src/USER-MANIFOLD/fix_nve_manifold_rattle.cpp

src/USER-MANIFOLD/fix_nvt_manifold_rattle.cpp

src/USER-MANIFOLD/manifold_gaussian_bump.cpp

src/USER-MANIFOLD/manifold_thylakoid_shared.cpp

src/USER-MESO/pair_edpd.cpp

src/USER-MESO/pair_tdpd.cpp

src/USER-OMP/pair_reaxc_omp.cpp