Update MiniWheel.cfg to allow surface attach

Allow the PackRat MiniWheel to be surface attached as well as stored onto chassis parts when using KAS on EVA.
[Forum Refrence - Includes pic of EVA assembled wheels for MKS bases](http://forum.kerbalspaceprogram.com/threads/86695-0-25-USI-Exploration-Pack-Small-parts-big-adventure%21-v-0-2-4-2014-10-13?p=1489474&viewfull=1#post1489474)