[T/SteadyStateDiffusion] Rename process type.

Tests/Data/Elliptic/circle_radius_1/circle_1e1_axi.prj

Tests/Data/Elliptic/circle_radius_1/circle_1e2_axi.prj

Tests/Data/Elliptic/circle_radius_1/circle_1e3_axi.prj

Tests/Data/Elliptic/circle_radius_1/circle_1e4_axi.prj

Tests/Data/Elliptic/circle_radius_1/circle_1e5_axi.prj

Tests/Data/Elliptic/circle_radius_1/circle_1e6_axi.prj

Tests/Data/Elliptic/cube_1x1x1_GroundWaterFlow/cube_1e0.prj

.../Elliptic/cube_1x1x1_GroundWaterFlow/cube_1e0_neumann.prj

...a/Elliptic/cube_1x1x1_GroundWaterFlow/cube_1e0_newton.prj

...tic/cube_1x1x1_GroundWaterFlow/cube_1e0_quadratic_hex.prj

Tests/Data/Elliptic/cube_1x1x1_GroundWaterFlow/cube_1e1.prj

.../Elliptic/cube_1x1x1_GroundWaterFlow/cube_1e1_neumann.prj

...a/Elliptic/cube_1x1x1_GroundWaterFlow/cube_1e1_newton.prj

Tests/Data/Elliptic/cube_1x1x1_GroundWaterFlow/cube_1e2.prj

.../Elliptic/cube_1x1x1_GroundWaterFlow/cube_1e2_neumann.prj

...a/Elliptic/cube_1x1x1_GroundWaterFlow/cube_1e2_newton.prj

Tests/Data/Elliptic/cube_1x1x1_GroundWaterFlow/cube_1e3.prj

...ic/cube_1x1x1_GroundWaterFlow/cube_1e3_bottom_neumann.prj

..._1x1x1_GroundWaterFlow/cube_1e3_bottom_neumann_newton.prj

...e_1x1x1_GroundWaterFlow/cube_1e3_calculatesurfaceflux.prj