Python shebang line

[adarshmalapaka]

The python shebang line (#!/usr/bin/env python) in control_lane.py (turtlebot3_autorace_driving/nodes/), detect_lane.py (turtlebot3_autorace_detect/nodes/), image_compensation.py (turtlebot3_autorace_camera/nodes/), and, image_projection.py (turtlebot3_autorace_camera/nodes/) should be updated to #!/usr/bin/env python3 for Python3 support as ROS Noetic supports Python3 exclusively.

The above can be applicable to all other python scripts/nodes in other sub-packages of the turtlebot3_autorace_2020 package.