fix: find_and_filter for inmemory - #1642

# prepare a query
q_doc = MyDoc(embedding=np.random.rand(128), text='query')

query = (
    db.build_query()
    .find(query=q_doc, search_field='embedding')
    .filter(filter_query={'text': {'$exists': True}})
    .build()
)

results = db.execute_query(query)
# Before: results was sorted from worst to best matches
# Now: It's sorted in the correct order, showing better matches first