Blender Git Loki

Fix T66999: Blender creates new cache for particles with step 10 instead 1

Update the default init step values to be the same for all caches.
This is actually a small hack as these values are not used on the
creation of the first cache. But the default init value is 1, so this
will not be noticeable anymore.

Reviewed By: Brecht

Differential Revision: https://developer.blender.org/D5271