[nodestructor] Fix no found error

[bl4de]

$ nodestructor -R ./node_

#####  nodestructor.py - static code analysis for Node.js applications  #####
# GitHub: bl4de | Twitter: @_bl4de | hackerone.com/bl4de | bloorq@gmail.com #


Traceback (most recent call last):
  File "/home/rafal.janicki/bin/nodestructor", line 103, in <module>
    FILE_LIST = os.listdir(sys.argv[2])
OSError: [Errno 2] No such file or directory: './node_