tkinter issue on startup.

[RubenGarcia]

Using python3-tk 3.6.9-1~18.04 and latest Sankaku-Downloader (tag: 0.0.2)

$ python main.py
Traceback (most recent call last):
  File "main.py", line 2, in <module>
    mainWindow.MainWindow()
  File "Sankaku-Downloader/mainWindow.py", line 44, in __init__
    self.iconbitmap(default=resource_path(datafile))
  File "/usr/lib/python3.7/tkinter/__init__.py", line 1869, in wm_iconbitmap
    return self.tk.call('wm', 'iconbitmap', self._w, '-default', default)
_tkinter.TclError: wrong # args: should be "wm iconbitmap window ?bitmap?"

[RubenGarcia]

Commenting out line 44 fixes the exception.