Contracts: Remove ED from base deposit (#3536)

- Update internal logic so that the storage_base_deposit does not
include ED
- add v16 migration to update ContractInfo struct with this change

Before:
<img width="820" alt="Screenshot 2024-03-21 at 11 23 29"
src="https://github.com/paritytech/polkadot-sdk/assets/521091/a0a8df0d-e743-42c5-9e16-cf2ec1aa949c">

After:
![Screenshot 2024-03-21 at 11 23
42](https://github.com/paritytech/polkadot-sdk/assets/521091/593235b0-b866-4915-b653-2071d793228b)

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Co-authored-by: Cyrill Leutwiler <[email protected]>
Co-authored-by: command-bot <>