samples: use findFile() in "python"

samples/python/tutorial_code/imgProc/erosion_dilatation/morphology_1.py

@@ -42,10 +42,10 @@ def dilatation(val):
     cv.imshow(title_dilatation_window, dilatation_dst)
 
 parser = argparse.ArgumentParser(description='Code for Eroding and Dilating tutorial.')
-parser.add_argument('--input', help='Path to input image.', default='../data/LinuxLogo.jpg')
+parser.add_argument('--input', help='Path to input image.', default='LinuxLogo.jpg')
 args = parser.parse_args()
 
-src = cv.imread(args.input)
+src = cv.imread(cv.samples.findFile(args.input))
 if src is None:
     print('Could not open or find the image: ', args.input)
     exit(0)