Update crop.json (#118)

* Update crop.json

This video only have 164 frames. Nonetype error occurs when using 165.0

* Update process_butterfly_videos.py

This need to be changed since the Butterfly dataset gallery is updated.

* Update process_butterfly_videos.py

Direct import from pocovidnet does not work

* revert sys.path

---------

Co-authored-by: jannisborn <jannis.born@gmx.de>

data/crop.json

@@ -898,7 +898,7 @@
         ],
         [
             0,
-            165.0
+            164.0
         ]
     ],
     "pocus_images/convex/Reg_Chen_2020_3A.png": [
@@ -1000,4 +1000,4 @@
             120.0
         ]
     ]
-}
+}