remove duplicate indexes

[ayrat555]

PGHero found duplicate indexes

Details
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On address_token_balancesaddress_token_balances_block_number_index (block_number) is covered by address_token_balances_block_number_address_hash_index (block_number, address_hash)
On token_instancestoken_instances_token_id_index (token_id) is covered bytoken_instances_pkey (token_id, token_contract_address_hash)

[coveralls]

Pull Request Test Coverage Report for Build c7fe77e0-943f-4487-9dbb-c11f5c905e6a

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 76 unchanged lines in 8 files lost coverage.
• Overall coverage decreased (-1.05%) to 75.1%

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Files with Coverage Reduction	New Missed Lines	%
apps/block_scout_web/lib/block_scout_web/controllers/chain/market_history_chart_controller.ex	1	78.57%
apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/http/httpoison.ex	1	0.0%
apps/ethereum_jsonrpc/test/support/ethereum_jsonrpc/case/parity/http_websocket.ex	1	0.0%
apps/indexer/lib/indexer/transform/addresses.ex	1	75.0%
apps/indexer/lib/indexer/block/fetcher.ex	3	83.13%
apps/ethereum_jsonrpc/test/support/ethereum_jsonrpc/web_socket/case/parity.ex	4	0.0%
apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/http.ex	12	52.0%
apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/web_socket/web_socket_client.ex	53	11.25%

Totals
Change from base Build 9b831152-1f8d-4300-9c6d-152576bd110c:	-1.05%
Covered Lines:	5281
Relevant Lines:	7032

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💛 - Coveralls