Merge pull request #16504 from bangerth/parens-point-tests

Use p[index] instead of p(index) for class Point in tests/.

diff --cc tests/feinterface/stokes.cc
Simple merge

diff --cc tests/fullydistributed_grids/copy_serial_tria_04.cc
Simple merge

diff --cc tests/non_matching/fe_interface_values_non_standard_meshes.cc
Simple merge

diff --cc tests/non_matching/root_finder.cc
Simple merge

diff --cc tests/non_matching/tensor_point_with_1D_quadrature.cc
Simple merge

diff --cc tests/particles/step-68.cc
Simple merge

diff --cc tests/simplex/poisson_02.cc
Simple merge

diff --cc tests/simplex/step-04-data_out_faces.cc
Simple merge

diff --cc tests/simplex/step-04.cc
Simple merge

diff --cc tests/simplex/step-07.cc
Simple merge

diff --cc tests/simplex/step-08.cc
Simple merge

diff --cc tests/simplex/step-12a.cc
Simple merge

diff --cc tests/simplex/step-17.cc
Simple merge

diff --cc tests/simplex/step-68.cc
Simple merge

diff --cc tests/sparsity/flux_sparsity_pattern_visiting_once.cc
Simple merge