Fix issues when saving the bruhs into resource folder

The patch fixes leftovers of bug 443875 of Krita behavior when
the resource is saved directly into the resource folder:

1) The "modified" flag is now reset (and well as modification date)
2) The name of the image is updated to the real versioned resource
   filename
3) The bursh **name** (the one saved **inside** the resource) is now
   kept the same and doesn't include the version suffix. It is done
   by passing the resource name into the saver using exportConfiguration
   object.

BUG:443875