Fix contract nested inputs

[vbaranov]

Motivation

Transformation of nested inputs like array from an array into form' view in contract method cause application Internal server error

Changelog

Handling of nested input types

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 0c58cdbd9bd5b73c4d3f6eb46d452a636a95aef2-PR-3376

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 10 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+1.05%) to 67.393%

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Files with Coverage Reduction	New Missed Lines	%
lib/block_scout_web/channels/address_channel.ex	2	36.96%
lib/block_scout_web/controllers/chain/market_history_chart_controller.ex	2	71.43%
lib/block_scout_web/checksum_address.ex	6	55.56%

Totals
Change from base Build 51ed8743b37b96b1e7840b14b6f07632695178b0:	1.05%
Covered Lines:	2042
Relevant Lines:	3030

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💛 - Coveralls