NodeJsPreprocessExecuteAndCheckExecutionStrategy has issues with `%%` on the output

[cuklev]

Lets say I submit console.log('%%');. Somehow this turns to a single % when my output is compared to the expected output leading to incorrect answers, which are actually correct.

The only thing I can think of that behaves like this is a Windows Batch file. That would mean that the output of the node process is interpreted as batch. Very illogical.

[ivaylokenov]

The code is here. Open a pull request and fix it in a more "logical" manner. 👍