Fix [#34685]: Dynamic paint sub-steps don't work if brush is animated through parent chain longer than 2 objects.

Maximum number of parents updated is now 5. Hopefully this will be enough until Blender has better subframe sampling system.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55517 954f8c5b-7b00-dc11-b283-0030488c597c