launch.py: Exit using sys.exit()

[ferdnyc]

cx_freeze doesn't like it if we quit OpenShot with exit(), triggering a traceback and complaining:

Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/cx_Freeze-4.3.4-py3.4-linux-x86_64.egg/cx_Freeze/initscripts/Console.py", line 27, in <module>
  File "openshot_qt/launch.py", line 105, in <module>
    main()
  File "openshot_qt/launch.py", line 76, in main
    exit()
NameError: name 'exit' is not defined

Using sys.exit() is more correct, and should appease cx_freeze.

[peanutbutterandcrackers]

Thank you for making OpenShot better, as always.

[ferdnyc]

Eh, in this case I was the one who made it worse in the first place. Those were my exit() statements that shouldn't have been there in the first place. 😆

[peanutbutterandcrackers]

Well, nobody's perfect. :D