Update example-contracts.js

src/app/editor/example-contracts.js

@@ -67,7 +67,7 @@ contract Ballot {
 }`
 
 var ballotTest = `pragma solidity ^0.4.7;
-import "./remix_tests.sol"; // this import is automatically injected by Remix.
+import "remix_tests.sol"; // this import is automatically injected by Remix.
 import "./ballot.sol";
 
 contract test3 {