Update MiniWheel.cfg

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
Merge pull request #28 from Deadpan110/patch-1

Update MiniWheel.cfg to allow surface attach