Clean issues

[aurexav]

subalfred storage-key --pallet BridgeKusamaGrandpa --item ImportedHeaders
0xad61a448d2290042116be82bf61332ebf7e5937ed7be0ea26416b155b0109b48

• Remove Kusama header migration code
• Typo fixes
• Closes KtonStaking is not distributing rewards after latest runtime upgrade on Crab #1604
• Closes Disable lock/stake calls. #1560
• Closes KtonDAO runtime migration on Crab and Darwinia ktondao/KtonDAO#23

[hackfisher]

Please also complete step 2 in this issue to close it: ktondao/KtonDAO#23

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RuntimeVersion {
    spec_name: "Darwinia Koi",
    impl_name: "DarwiniaOfficialRust",
    authoring_version: 0,
-   spec_version: 6662,
+   spec_version: 6710,
    impl_version: 0,
    transaction_version: 0,
    state_version: 0,
}

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