BUG: adding metadata to MatpesStaticFlow

[ThomasWarford]

Describe the bug
The metadata field is not populated

To Reproduce

from atomate2.vasp.flows.matpes import MatPesStaticFlowMaker, MatPesMetaGGAStaticMaker, MatPesGGAStaticMaker
from atomate2.vasp.powerups import add_metadata_to_flow
from pymatgen.io.vasp.sets import MatPESStaticSet
from jobflow import run_locally
from pymatgen.core import Structure
from ase.io import read



if __name__ == "__main__":
    structure = Structure(
    lattice=[[0, 2.13, 2.13], [2.13, 0, 2.13], [2.13, 2.13, 0]],
    species=["Mg", "O"],
    coords=[[0, 0, 0], [0.5, 0.5, 0.5]],
    )

    matpes_flow = MatPesStaticFlowMaker().make(structure)

    matpes_flow = add_metadata_to_flow(matpes_flow, {"extra_id": 'hello'})

    run_locally(matpes_flow, create_folders=True,)

Expected behavior
The GGA and meta-GGA entries in the mongodb have "extra_id": "hello" in the metadata field.

[ThomasWarford]

I have modified the make method of MatPesStaticFlowMaker to fix this, but I assume that isn't the fix you'd like to see