Fix revert reason message detection

[vbaranov]

Motivation

Revert reason is not shown for transactions at xDai instance
https://blockscout.com/poa/xdai/tx/0x4600d60565943c10b5486953a406de6e04612f62b2c590a16c4a72af9d658555/internal_transactions

Changelog

• gas_price -> gasPrice in eth_call request
• parse with "Reverted prefix"
• decode message from response of eth_call

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

[github-actions]

Pull Request Test Coverage Report for Build ab0c4efc4da4ca0864679b39dc48830f9924b545-PR-3219

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-16.4%) to 55.682%

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Totals
Change from base Build b20995a5e4a26761dcf772cd00e3d4fab5659f63:	-16.4%
Covered Lines:	441
Relevant Lines:	792

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💛 - Coveralls