utils: raspberrypi: ctt: Fix pycodestyle E302

E302 expected 2 blank lines, found 0

Note that issues are still flagged, due to the use of docstrings as
multi-lines comments. This will be addressed separately.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>

utils/raspberrypi/ctt/ctt.py

@@ -34,6 +34,7 @@ blank json file. This has been done to avoid reproducing the entire json file
 in the code here, thereby avoiding unecessary clutter.
 """
 
+
 """
 Get the colour and lux values from the strings of each inidvidual image
 """
@@ -702,6 +703,7 @@ class Camera:
             self.log += '\nERROR: Images are from different cameras'
             return 0
 
+
 def run_ctt(json_output, directory, config, log_output):
     """
     check input files are jsons