Remove unused parts of slippage query

[fhenneke]

The current slippage query has unused code:

• There is a TokenList parameter and a token_list table, but they are never used.

solver-rewards/queries/dune_v2/period_slippage.sql

Lines 224 to 227 in d4ae25b

	,token_list as (
	SELECT from_hex(address_str) as address
	FROM ( VALUES {{TokenList}} ) as _ (address_str)
	)

• There are not internalized imbalances anymore so this part seems unnecessary (and the subsequent join)

solver-rewards/queries/dune_v2/slippage_excluded_batches.sql

Lines 25 to 26 in d4ae25b

	or 0x413530a7beB9Ff6C44e9e6C9001C93B785420C32 in (buy_token_address, sell_token_address) -- exclude PFPAsia. NEEDS TO BE REMOVED FROM THIS LIST
	or 0xe7468080c033cE50Dd09A22ad1E58D1BDA69E436 in (buy_token_address, sell_token_address) -- exclude YUMYUM. NEEDS TO BE REMOVED FROM THIS LIST

Removing the respective code should be relatively safe. Removing the parameter requires additional changes to how the query is called.