[test][bind] Simplify the bind calls for fvgeometry, elemvolvars, and elemfluxvarcache.

...on/cellcentered/tpfa/test_tpfafvgeometry_nonconforming.cc

...n/rotationsymmetry/test_rotationsymmetric_gridgeometry.cc

...retization/staggered/test_staggered_free_flow_geometry.cc

test/freeflow/navierstokes/angeli/main.cc

test/freeflow/navierstokes/channel/1d/problem.hh

test/freeflow/navierstokes/channel/2d/problem.hh

test/freeflow/navierstokes/donea/problem.hh

test/freeflow/navierstokes/kovasznay/problem.hh

test/freeflow/navierstokes/l2error.hh

test/freeflow/navierstokes/sincos/main.cc

test/freeflow/navierstokesnc/channel/problem.hh

test/freeflow/navierstokesnc/densitydrivenflow/problem.hh

test/freeflow/navierstokesnc/maxwellstefan/problem.hh

test/freeflow/shallowwater/bowl/main.cc

test/freeflow/shallowwater/dambreak/problem.hh

test/geomechanics/poroelastic/main.cc

test/io/gridmanager/gmshboundaryflagtest.hh

...ltidomain/boundary/stokesdarcy/1p2c_2p2c/problem_darcy.hh

...domain/boundary/stokesdarcy/1p_1p/convergencetest/main.cc

test/multidomain/embedded/1d3d/1p2c_richards2c/main.cc