Fix: failed transactions are not displayed with the correct state in Activities tab and sort order is enforced correctly for activities/transactions within the same block

[hboon]

Fixes #2192

• transaction ID should be included as the primary key for EventActivity (the Realm object representing activities)
• transactions that failed were displayed like they are successful [1]
• sort order of activities (i.e events) and transactions within the same block was incorrect

This PR contains a database migration.

Before PR	-> Error states displayed correctly	-> With order corrected

[1]:

The transaction "entity" returned by Etherscan contains the field isError which is "0" when there are no errors. The field we were checking against for errors error, either no longer exists or might have no value even when isError == 1.

{
    "blockNumber": "10999432",
    "timeStamp": "1601950354",
    "hash": "0xdfe89ded2490f6917c6aa83fd4b4d9790ac40521c441b419980f94abf9ae14bc",
    "nonce": "32",
    "blockHash": "0x33cb8281386e9c24aeb4ae080259ce129f259c66d9f310394edb967f8e6cbfed",
    "transactionIndex": "128",
    "from": "0xfcabe3451ac8edfb8fb6b9274c2e095d9ccc8082",
    "to": "0x7a250d5630b4cf539739df2c5dacb4c659f2488d",
    "value": "0",
    "gas": "224637",
    "gasPrice": "77000001459",
    "isError": "0",
    "txreceipt_status": "1",
    "input": "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",
    "contractAddress": "",
    "cumulativeGasUsed": "12419473",
    "gasUsed": "186820",
    "confirmations": "14337"
}