Loadstring tests shouldn't rely on existence of getscriptbytecode

[phoriah]

Replaced it with luau bytecode taken from https://github.com/TheGreatSageEqualToHeaven/Fiu/blob/5882219fac722129bf050a590fe7577aa1a0de1e/Example.lua#L1

[phoriah]

@jdpatdiscord @EpixScripts @LuaOranges

[jdpatdiscord]

I understand interest in working on something, but any new exploits that would be interested in adhering to UNC standards are going to be rare due to the anti-tamper, and that's an understatement. I am no longer a maintainer of this and haven't been for two years. Because of this, I recommend save your efforts for something else.