fix: storage item typo in unified accounts

[ashutoshvarma]

Pull Request Summary
Fix the typo in mapping storage names.

Since it's already deployed in Shibuya testnet, we have two options.

1. Add migrations for this
2. Clear the pallet storage using sudo call, since it's only being used internally and total mappings are around 10

EDIT: using OnRuntimeUpgrade hook to clear the storage in Shibuya for corrupted mappings after the renaming.

Check list

• added or updated unit tests
• updated Astar official documentation
• added OnRuntimeUpgrade hook for precompile revert code registration
• updated spec version
• updated semver

[github-actions]

Package	Line Rate	Branch Rate	Health
pallets/dynamic-evm-base-fee/src	81%	0%	✔
chain-extensions/types/assets/src	0%	0%	❌
pallets/collator-selection/src	69%	0%	➖
precompiles/dapps-staking/src	93%	0%	✔
precompiles/xcm/src	84%	0%	✔
chain-extensions/dapps-staking/src	0%	0%	❌
precompiles/sr25519/src	79%	0%	➖
pallets/xvm/src	40%	0%	❌
pallets/xc-asset-config/src	53%	0%	➖
precompiles/utils/src/testing	62%	0%	➖
chain-extensions/pallet-assets/src	0%	0%	❌
pallets/ethereum-checked/src	48%	0%	❌
pallets/dapps-staking/src/pallet	85%	0%	✔
chain-extensions/xvm/src	0%	0%	❌
pallets/unified-accounts/src	80%	0%	✔
precompiles/assets-erc20/src	76%	0%	➖
chain-extensions/types/xvm/src	0%	0%	❌
precompiles/substrate-ecdsa/src	78%	0%	➖
precompiles/batch/src	80%	0%	✔
chain-extensions/types/dapps-staking/src	0%	0%	❌
precompiles/utils/src	68%	0%	➖
precompiles/xvm/src	75%	0%	➖
primitives/src	62%	0%	➖
pallets/pallet-xcm/src	53%	0%	➖
pallets/dapps-staking/src	81%	0%	✔
pallets/contracts-migration/src	0%	0%	❌
precompiles/utils/macro/src	0%	0%	❌
primitives/src/xcm	66%	0%	➖
pallets/block-reward/src	85%	0%	✔
Summary	58% (2652 / 4587)	0% (0 / 0)	➖

Minimum allowed line rate is 50%

[shaunxw]

Good to go if all CI checks passed.