change constructor param to config

Changes the Marketplace constructor parameter `configuration` to `config` to prevent overshadowing the `configuration()` method.

contracts/Marketplace.sol

@@ -62,30 +62,30 @@ contract Marketplace is SlotReservations, Proofs, StateRetrieval, Endian {
   }
 
   constructor(
-    MarketplaceConfig memory configuration,
+    MarketplaceConfig memory config,
     IERC20 token_,
     IGroth16Verifier verifier
   )
-    SlotReservations(configuration.reservations)
-    Proofs(configuration.proofs, verifier)
+    SlotReservations(config.reservations)
+    Proofs(config.proofs, verifier)
   {
     _token = token_;
 
     require(
-      configuration.collateral.repairRewardPercentage <= 100,
+      config.collateral.repairRewardPercentage <= 100,
       "Must be less than 100"
     );
     require(
-      configuration.collateral.slashPercentage <= 100,
+      config.collateral.slashPercentage <= 100,
       "Must be less than 100"
     );
     require(
-      configuration.collateral.maxNumberOfSlashes *
-        configuration.collateral.slashPercentage <=
+      config.collateral.maxNumberOfSlashes *
+        config.collateral.slashPercentage <=
         100,
       "Maximum slashing exceeds 100%"
     );
-    _config = configuration;
+    _config = config;
   }
 
   function configuration() public view returns (MarketplaceConfig memory) {