fix indentation in excel4.py

[mkunz7]

fixes

Traceback (most recent call last):
  File "SharpShooter.py", line 21, in <module>
    from modules import *
  File "/root/web/SharpShooter/modules/excel4.py", line 39
    if i == 0:
     ^
IndentationError: expected an indented block