fix last element in hidden_states for XGLM
# What does this PR do?

Same fix as in #16167 (where the last element in `hidden_states` is different between PT/Flax version.)

This was missed in the previous PR - because XGLM model test overwrites the common (more thorough) PT/Flax equivalence test.

This fix is tested with #16280 and passed !
_The documentation is not available anymore as the PR was closed or merged._