Fixing indentation and syntax on 3 functions

[LopezChris]

Addressing these issues:

from goprocam import GoProCamera
  File "/usr/local/lib/python3.7/site-packages/goprocam/GoProCamera.py", line 493
    folder = ""
         ^
IndentationError: expected an indented block

from goprocam import GoProCamera
  File "/usr/local/lib/python3.7/site-packages/goprocam/GoProCamera.py", line 849
    def getPhotoEXIF(self, option="", folder,="" file=""):
SyntaxError: invalid syntax

from goprocam import GoProCamera
  File "/usr/local/lib/python3.7/site-packages/goprocam/GoProCamera.py", line 488
    self.gpControlCommand("digital_zoom?range_pcnt=" + zoomLevel)
IndentationError: expected an indented block

[KonradIT]

Thank you!