fix: drop constructor

Author: 0xrusowsky

test/mocks/MockCounter.sol

@@ -5,10 +5,6 @@ pragma solidity >=0.6.0 <0.9.0;
 contract MockCounter {
     uint256 public count;
 
-    constructor() payable {
-        count = 0;
-    }
-
     function increment() public {
         count++;
     }