Steps to Reproduce

1. Create a ListTile with Icon (without parameters, except icon itself of course) as leading

Expected results: Color is 'on surface variant', size is 18dp

Actual results: Color doesn't match, size is 24dp

Code sample: https://dartpad.dev/?id=2605ca48e55d86312e3daec99e1ee950&channel=master

Reference: https://m3.material.io/components/lists/specs#7134fed0-fd57-46a6-b126-f1c47b12531b