[examples] Enable NT Flush in Field2d examples (#3013)

wpilibcExamples/src/main/cpp/examples/SimpleDifferentialDriveSimulation/cpp/Robot.cpp

@@ -14,6 +14,10 @@
 class Robot : public frc::TimedRobot {
  public:
   void RobotInit() override {
+    // Flush NetworkTables every loop. This ensures that robot pose and other
+    // values are sent during every iteration.
+    SetNetworkTablesFlushEnabled(true);
+
     m_trajectory = frc::TrajectoryGenerator::GenerateTrajectory(
         frc::Pose2d(2_m, 2_m, 0_rad), {}, frc::Pose2d(6_m, 4_m, 0_rad),
         frc::TrajectoryConfig(2_mps, 2_mps_sq));