Update RigidBotBig.ini

These settings tested by a Rigidbot G+ community.  these setting are called the Community based PLA settings located here http://marvinstuart.com/rigidbot/ and http://rigidtalk.com/wiki/index.php?title=Main_Page
Merge pull request #1034 from marvinstuart/patch-1

Update RigidBotBig.ini