Fix l2vlan igmp snooping enabled not being configurable

[melkypie]

Change Summary

Seems like with the introduction of #897, the tenant igmp snooping enabled option was changed correctly but this was overlooked.

Types of changes

• 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 change)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Documentation content changes
• Other (please describe):

Related Issue(s)

Component(s) name

arista.avd.eos_designs

Proposed changes

How to test

Checklist:

• My code has been rebased from devel before I start
• I have read the CONTRIBUTING document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have updated molecule CI testing accordingly
• All new and existing tests passed (pre-commit, make linting and make sanity-lint).

[ClausHolbechArista]

@melkypie Thanks for catching this. Can I ask you to add test coverage in molecule since it must be missing (your change did not give any molecule output changes). We should have one l2vlan with false and another with true and the rest unset.

[ClausHolbechArista]

LGTM