update app.py

app.py

@@ -50,7 +50,7 @@ with open("sentinel_datasets.json") as f:
     data = json.load(f)
 
 # Load the band options from band_options.json file
-with open("band_options.json") as f:
+with open("band.json") as f:
     band_options = json.load(f)
     
 # Function to load available bands for the selected dataset and allow user to create custom formula