Fix all valgrind leak issues in tests

Signed-off-by: Deukhoofd <deukhoofd@gmail.com>

src/Evaluator/Iterator/Iterator.hpp

@@ -25,7 +25,7 @@ namespace Porygon::Evaluation{
             : _iterator(table->GetTableIterator()), _end(table->GetTableIteratorEnd()){}
 
         shared_ptr<EvalValue> GetCurrent() final{
-            return make_shared<StringEvalValue>(_iterator->first.GetString());
+            return make_shared<StringEvalValue>(*_iterator->first.GetString());
         }
 
         bool MoveNext() final{