show deduplicated zero balances

apps/explorer/lib/explorer/chain.ex

@@ -2965,6 +2965,7 @@ defmodule Explorer.Chain do
     |> CoinBalance.fetch_coin_balances(paging_options)
     |> page_coin_balances(paging_options)
     |> Repo.all()
+    |> Enum.dedup()
   end
 
   def get_coin_balance(address_hash, block_number) do

apps/explorer/lib/explorer/chain/address/coin_balance.ex

@@ -75,7 +75,6 @@ defmodule Explorer.Chain.Address.CoinBalance do
     from(
       cb in CoinBalance,
       where: cb.address_hash == ^address_hash,
-      where: cb.value > ^0,
       inner_join: b in Block,
       on: cb.block_number == b.number,
       order_by: [desc: :block_number],