[BUG] Certain strings can block obfuscation due to lexing errors

**Describe the bug**
Certain strings cause lexing errors preventing obfuscation.

**To Reproduce**

Try to obfuscate:
```lua
local test = [=[
unescape(encodeURI(_0x4642b)) + '\u0d80', _0x51c383 = _0x480094[_0x1f6b0d(0x29d)];
]=]
```

> PROMETHEUS: Lexing Error at Position 2:36, Unexpected char "0"! Expected one of "{"
