Fix logs list API endpoint response

[vbaranov]

Motivation

• The response of logs list api endpoint doesn't contain 0x prefix
• blockNumber returns transactionIndex and vise-versa

Example:
https://blockscout.com/poa/xdai/api?module=logs&action=getLogs&fromBlock=11262794&toBlock=latest&address=0x481c034c6d9441db23Ea48De68BCAe812C5d39bA&topic0=0x3c798bbcf33115b42c728b8504cff11dd58736e9fa789f1cda2738db7d696b2a&topic1=0x00000000000000000000000050d967fd81ad09befb6ff11e8ac6062a3ce11eb1&topic0_1_opr=and

{"address":"0x481c034c6d9441db23ea48de68bcae812c5d39ba","blockNumber":"1","data":"0x00000000000000000000000000000000000000000000001f2bba5d84f99c0000","gasPrice":"0","gasUsed":"27D04","logIndex":"1","timeStamp":"5BBBA539","topics":["0x3c798bbcf33115b42c728b8504cff11dd58736e9fa789f1cda2738db7d696b2a","0x00000000000000000000000050d967fd81ad09befb6ff11e8ac6062a3ce11eb1","0x0000000000000000000000007301cfa0e1756b71869e93d4e4dca5c7d0eb0aa6",null],"transactionHash":"0x6505311fdb0b65530b4c80a7eb224f9b267a4099c5924e5b51a85ca7e8f756ca","transactionIndex":"BB22C4"},

Checklist for your Pull Request (PR)

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so by submitting a PR to https://github.com/blockscout/docs
• If I added/changed/removed ENV var, I submitted a PR to https://github.com/blockscout/docs to update the list of env vars at https://github.com/blockscout/docs/blob/master/for-developers/information-and-settings/env-variables.md and I updated the version to master in the Version column. Changes will be reflected in this table: https://docs.blockscout.com/for-developers/information-and-settings/env-variables.
• If I add new indices into DB, I checked, that they are not redundant with PGHero or other tools

[coveralls]

Pull Request Test Coverage Report for Build 984f499910b57569e90e11809cc6dca29915cf57-PR-3323

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 9 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+3.2%) to 74.482%

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Files with Coverage Reduction	New Missed Lines	%
lib/block_scout_web/controllers/chain/market_history_chart_controller.ex	2	71.43%
lib/block_scout_web/notifier.ex	7	86.9%

Totals
Change from base Build 06405b78a7020ef76a767876267abd378227ad2f:	3.2%
Covered Lines:	1979
Relevant Lines:	2657

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💛 - Coveralls