Module 3 - FA2 token Error in reference answer due to old syntax

[Alvinleenh]

• [Microsoft Windows 10 Home] System Information

• [Google Chrome Version 96.0.4664.45] Browser type and version

• [Windows 10.0.19043 Build 19043] OS type and version

• [> Error: invalid flag usage: initial-cast Error > Click on "Show Answer" for reference. ]

• [Error message flagged, even through the answer is exactly same as reference] Describe the bug

  Steps to reproduce the behavior:
  
  1. Go to https://cryptocodeschool.in/tezos/academy/module-03/chapter-03
  2. Fill in contract.py, with reference answer
  3. Click check button
  4. There is error flagged in console
  > Error: invalid flag usage: initial-cast Error
  > Click on "Show Answer" for reference.
  

[Reference answer need to be updated based on latest syntax in FA2 template, so that we can proceed to next session] Expected behavior
A clear and concise description of what you expected to happen.