feat: No more fee taking

- This required an extra transfer into the router at the end of the swap sequence, costing an unnecessary 40k gas or more for certain protocols.

foundry/test/Constants.sol

@@ -15,8 +15,6 @@ contract Constants is Test, BaseConstants {
     address ADMIN = makeAddr("admin"); //admin=us
     address BOB = makeAddr("bob"); //bob=someone!=us
     address FUND_RESCUER = makeAddr("fundRescuer");
-    address FEE_SETTER = makeAddr("feeSetter");
-    address FEE_RECEIVER = makeAddr("feeReceiver");
     address EXECUTOR_SETTER = makeAddr("executorSetter");
     address ALICE = 0xcd09f75E2BF2A4d11F3AB23f1389FcC1621c0cc2;
     uint256 ALICE_PK =