osd: Fix bug with zero of whole object + truncate in same request

Fast EC asserts if a request contains both a zero for the whole object
plus a truncate to less than the original object size in the same
request.

An alternative request that produces the same result is a request
that truncates an object to 0 and then truncates it to a size less
that the original object size.

The problem is an optimization that tries to delete and recreate the
object which is then followed by trying to reduce the object size.

Fixes: https://tracker.ceph.com/issues/78340

Signed-off-by: Bill Scales <bill_scales@uk.ibm.com>