Fix issue with congruent_triangles_2 not showing x

fix #45164; fix #45163; fix #45162; fix #45155; fix #45143; fix #45142;
fix #45141; fix #45140; fix #45134; fix #45125; fix #45105; fix #45101;
fix #45098; fix #45094; fix #45087; fix #45082; fix #45076; fix #45065;
fix #45057; fix #45044; fix #45034; fix #44966; fix #44928; fix #44817;
fix #36534; fix #32123

Test plan: http://localhost:8000/exercises/congruent_triangles_2.html?seed=62&problem=parr&debug note that "x" is shown.