Remove duplicated test

test/libsolidity/semanticTests/operators/custom/multiple_custom_operators_same_contract.sol

@@ -1,18 +0,0 @@
-// TODO: Isn't it suppose to be the exact same as all_operators.sol ?
-
-type MyInt is int;
-using {add as +} for MyInt;
-
-function add(MyInt, MyInt) pure returns (MyInt) {
-    return MyInt.wrap(0);
-}
-
-contract C {
-    function f() public pure returns (MyInt t) {
-        t = MyInt.wrap(2) + MyInt.wrap(7);
-    }
-}
-// ====
-// compileViaYul: also
-// ----
-// f() -> 0