joystick device isnt always js0

[EdCarrasco]

SeadragonAUV/laptop_joystick.sh

Lines 2 to 3 in 97980c3

	sudo chmod a+rw /dev/input/js0
	rosparam set joy_node/dev "/dev/input/js0"

Suggestion: Make a function that takes a parameter so that the user can input their own js#. Assuming they know which js# is the joystick