clean up GRHydro schedule file

[Roland Haas]

GRHydro currently:

• schedules storage for conformal_state which it no longer uses (since git hash 8a91441 "GRHydro: * remove dependence on StaticConformal * change calculation of the determinant of the 3-metric from a subroutine call to a macro." of einsteinevolve)
• tries to register its banner in WRAGH which is too late, it must be done in STARTUP (http://einsteintoolkit.org/referencemanual/ReferenceManual.html#x1-174000A2)

Pull request

https://bitbucket.org/einsteintoolkit/einsteinevolve/pull-requests/20

fixes these.

‌

[Roland Haas]

Please review

[Roland Haas]

Unless objected I will apply this after 2023-03-30

[Roland Haas]

@Steven R. Brandt says (in pull request): please apply.

[Roland Haas]

Applied as git hash d34a3dc "GRHydro: remove storage statement for unused grid scalar" of einsteinevolve