shuffle.js: remove newlines and carriage returns from gdPath before using it

[layercak3]

A lot of users that edit directory.txt may get the couldn't find your GD directory error because there's a newline (or maybe a carriage return) in it which a lot of editors add at the end of the file (the popular Windows Notepad is an exception when creating new files). There's a whole rabbit hole you can go down on about line endings but essentially this PR removes them because otherwise they're read as part of the pathname which will cause the game directory to not be found.

[GDColon]

Sounds good, just accepted a PR though so fix the conflict if possible

[NicoXploit]

Hello! For some reason my GD randomizer is not opening, not because it crashed or couldn't find the game folder, do you have to use a specific program?
Because the error message says:
"line 1
character: 1
synax error
Code: 800A03EA
Source: Microsoft JScript Compilation Error"