[EASY] Change slippage wrapper for consistency with old slippage query (

#49)

* fix parameter to ethereum for current slippage accounting

* make output column of eth_slippage_wei a float

cowprotocol/accounting/slippage/slippage_query_3427730.sql

@@ -2,15 +2,15 @@ select
     solver_address,
     concat(environment, '-', name) as solver_name,
     slippage_usd as usd_value,
-    slippage_wei as eth_slippage_wei,
+    1.0 * slippage_wei as eth_slippage_wei,
     concat(
         '<a href="https://dune.com/queries/4070065',
-        '&blockchain={{blockchain}}',
+        '&blockchain=ethereum',
         '&start_time={{start_time}}',
         '&end_time={{end_time}}',
         '&slippage_table_name=slippage_per_transaction',
         '" target="_blank">link</a>'
     ) as slippage_per_transaction
-from "query_4070065(blockchain='{{blockchain}}',start_time='{{start_time}}',end_time='{{end_time}}',slippage_table_name='slippage_per_solver')"
-inner join cow_protocol_{{blockchain}}.solvers
+from "query_4070065(blockchain='ethereum',start_time='{{start_time}}',end_time='{{end_time}}',slippage_table_name='slippage_per_solver')"
+inner join cow_protocol_ethereum.solvers
     on solver_address = address