Fix path for check_gswave log

[cristobal-sifon]

Traceback (most recent call last):
  File "/u/sifon/.local/bin/pygmos", line 4, in <module>
    __import__('pkg_resources').run_script('pygmos==0.1.0.dev1', 'pygmos')
  File "/u/sifon/anaconda3/envs/pyraf/lib/python2.7/site-packages/pkg_resources/__init__.py", line 658, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/u/sifon/anaconda3/envs/pyraf/lib/python2.7/site-packages/pkg_resources/__init__.py", line 1438, in run_script
    exec(code, namespace, namespace)
  File "/u/sifon/.local/lib/python2.7/site-packages/pygmos-0.1.0.dev1-py2.7.egg/EGG-INFO/scripts/pygmos", line 106, in <module>
    main()
  File "/u/sifon/.local/lib/python2.7/site-packages/pygmos-0.1.0.dev1-py2.7.egg/EGG-INFO/scripts/pygmos", line 100, in main
    reduction.mos(args, mask, science, assoc)
  File "/u/sifon/.local/lib/python2.7/site-packages/pygmos-0.1.0.dev1-py2.7.egg/pygmos/spectroscopy/reduction.py", line 131, in mos
    args.objectid, mask, gmos.gswavelength.logfile, 'gswcheck.log')
  File "/u/sifon/.local/lib/python2.7/site-packages/pygmos-0.1.0.dev1-py2.7.egg/pygmos/spectroscopy/check_gswave.py", line 29, in main
    rms = check(pathin, mask, outfilename)
  File "/u/sifon/.local/lib/python2.7/site-packages/pygmos-0.1.0.dev1-py2.7.egg/pygmos/spectroscopy/check_gswave.py", line 42, in check
    log = open(path)
IOError: [Errno 2] No such file or directory: 'ACT-CL J0102.6+0201/maskGS2017BQ076-01/gswavelength.log'