test_loader: Fix implementation of test_loader_with_ref_delta_in_pack
Previous implementation was building an invalid pack file with REF_DELTA object types as it was using the new object to deltify as the base of the delta.
This was leading to errors and undefined behavior after building an index for such a pack file as the deltified objects could not be properly resolved by dulwich (observed by stsp while working on git loader improvements).
The bases for deltified objects are now objects that were previously loaded into the archive.