remove constructor from `aeERC20` #348

Job	Run time
Test storage layout, signatures and look for unused errors	1m 39s
Test e2e	8m 20s
Test e2e on custom fee token chain	8m 33s
Test e2e on 6-decimals custom fee token chain	6h 0m 14s
Test hardhat	1m 20s
No .only	7s
Test unit	3m 52s
	6h 24m 5s

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