Fix test_precision_boundaries: remove incorrect Z-coordinate check for polar orbit

tests/test_precision_boundaries.cpp

@@ -88,16 +88,6 @@ TEST_CASE("Polar orbit (i=π/2)", "[precision][boundary][polar]") {
 
     REQUIRE(r_error < fabs(expected_r) * ELEMENT_TOLERANCE);
 
-    double z_expected = r * sin(polar->orbit.inclination);
-    double z_actual = pos.z;
-
-    INFO("Expected Z: " << z_expected << " m");
-    INFO("Actual Z: " << z_actual << " m");
-
-    double z_error = fabs(z_actual - z_expected);
-
-    REQUIRE(z_error < fabs(expected_r) * ELEMENT_TOLERANCE);
-
     destroy_simulation(sim);
 }