planning: reduced the samples for lateral trajectories

modules/planning/lattice/trajectory_generation/end_condition_sampler.cc

@@ -42,7 +42,7 @@ EndConditionSampler::EndConditionSampler(
 std::vector<std::pair<std::array<double, 3>, double>>
 EndConditionSampler::SampleLatEndConditions() const {
   std::vector<std::pair<std::array<double, 3>, double>> end_d_conditions;
-  std::array<double, 5> end_d_candidates = {0.0, -0.25, 0.25, -0.5, 0.5};
+  std::array<double, 3> end_d_candidates = {0.0, -0.5, 0.5};
   std::array<double, 4> end_s_candidates = {10.0, 20.0, 40.0, 80.0};
 
   for (const auto& s : end_s_candidates) {