Fixing broken calibrate_intrinsics.  Write files to json

Changing existing files to .json name

Change-Id: I24c9023700939f8736442d0a61390e4e92a74da5
diff --git a/y2020/vision/tools/python_code/BUILD b/y2020/vision/tools/python_code/BUILD
index 1892a88..a55cb23 100644
--- a/y2020/vision/tools/python_code/BUILD
+++ b/y2020/vision/tools/python_code/BUILD
@@ -12,7 +12,7 @@
     args = [
         "sift_training_data.h",
     ],
-    data = glob(["calib_files/*.txt"]) + glob([
+    data = glob(["calib_files/*.json"]) + glob([
         "test_images/*.png",
     ]),
     default_python_version = "PY3",
@@ -60,7 +60,7 @@
         "sift_training_data_test.h",
         "test",
     ],
-    data = glob(["calib_files/*.txt"]) + glob([
+    data = glob(["calib_files/*.json"]) + glob([
         "test_images/*.png",
     ]),
     default_python_version = "PY3",