Handle unfunded zeroconf channels in update_unfunded_state

[f321x]

This adds handling of zeroconf channels with funding tx height TX_HEIGHT_LOCAL. This way the client removes channels if the LSP fails to broadcast the funding transaction instead of trying to continue using it. It also allows the LSP to remove the channel on client side by sending shutdown instead of broadcasting the funding tx, the client will then remove the channel as it is in CLOSING state, this is useful if the LSP wants to abort the opening procedure, e.g. if the client fails to provide the preimage.
Required for #9584