Fix tab indent

rock-glacier-dataset.py

@@ -70,9 +70,9 @@ class RockGlacierDataset(datasets.GeneratorBasedBuilder):
    def _generate_examples(self, files):
        for i, path in enumerate(files):
            file_name = os.path.basename(path)
-	   if file_name.endswith("png"):
- 	       yield i, {
-		   "image": path,
+           if file_name.endswith(".png"):
+               yield i, {
+                   "image": path,
 		   "labels": os.path.basename(os.path.dirname(path)).lower(),
 	       }