add the missing AMMDeposit flag TF_TWO_ASSET_IF_EMPTY

[ckeshava]

High Level Overview of Change

Sister PR from XRPLF/xrpl.js#2667
Fixes XRPLF/xrpl.js#2666

Context of Change

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Tests (You added tests for code that already exists, or your new feature included in this PR)
• Documentation Updates
• Release

Did you update CHANGELOG.md?

• Yes
• No, this change does not impact library users

Test Plan

I don't know enough about this particular flag to write tests. Please let me know if you have ideas

[ckeshava]

@khancode @pdp2121 can you please review this PR?