Update to the new flexbe app

[awesomebytes]

Updating the launch file to launch the correct new app.

By the way the tutorial says to execute:

roslaunch flexbe_onboard behavior_testing.launch
[behavior_testing.launch] is neither a launch file in package [flexbe_onboard] nor is [flexbe_onboard] a launch file name

Which I found out the correct command is:

roslaunch flexbe_onboard behavior_onboard.launch

I didn't want to change the wiki as you haven't migrated yet to the new app I guess.