fix(behavior_path_planner): fix redundantAssignment warning (#7560)

Signed-off-by: Ryuta Kambe <ryuta.kambe@tier4.jp>

Author: veqcc

planning/behavior_path_planner/autoware_behavior_path_planner_common/test/test_turn_signal.cpp

@@ -355,7 +355,6 @@ TEST(BehaviorPathPlanningTurnSignal, Condition3)
 
   TurnSignalInfo behavior_signal_info;
   behavior_signal_info.turn_signal.command = TurnIndicatorsCommand::ENABLE_RIGHT;
-  behavior_signal_info.turn_signal.command = TurnIndicatorsCommand::ENABLE_RIGHT;
   behavior_signal_info.desired_start_point.position = createPoint(5.0, 0.0, 0.0);
   behavior_signal_info.desired_start_point.orientation = createQuaternionFromYaw(0.0);
   behavior_signal_info.desired_end_point.position = createPoint(70.0, 0.0, 0.0);