Fix crypto/defi/vaults not showing for default and -k lp

[montezdesousa]

Description

Solving issue #1940 where vaults were not being displayed. Error occurred because 'NaN' values on the APY field are being replaced by "NA" before the sort_values method acted on it, so it was trying to compare str to float. Just changed the replace of 'NaN' values to after the sort_values method.

Before:

After:

• Summary of the change / bug fix.
• Link # issue, if applicable.
• Screenshot of the feature or the bug before/after fix, if applicable.
• Relevant motivation and context.
• List any dependencies that are required for this change.

How has this been tested?

pytest tests/openbb_terminal/cryptocurrency/defi/test_coindix_model.py --record-mode=rewrite
pytest tests/openbb_terminal/cryptocurrency/defi/test_coindix_view.py --record-mode=rewrite

Others

• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My code passes all the checks pylint, flake8, black, ... To speed up development you should run pre-commit install.
• New and existing unit tests pass locally with my changes. You can test this locally using pytest tests/....

[colin99d]

Looks great! Nice work.

[montezdesousa]

Looks great! Nice work.

Thanks!!