Webform Conditional auto un-select
Try Webform Conditional module, this has some extended conditional rule on radio button and other form elements:


  Webform already has support for conditional fields on multi-page forms. For example Field C on Page 2 can be dependent on Field A on Page 1. This module adds the ability to have conditional fields on the same page. This module adds the ability to have Field B on page 1 be dependent on Field A also on Page 1.