Incorret lexing of single line comments

[RageKnify]

Single line comments in files using CRLF line endings result in the rest of the file being ignored.

To Reproduce
Since a file is required the best way to demonstrate the bug is to run with the following file: cargo run -- test.txt test.txt
The file contains:

console.log('0')
// .
console.log('1')

Expected behavior
boa should output:

0
1
undefined

but instead we do not get the 1

This is probably what caused us to not see an increase in the number of passing test262 tests, a lot of them are not being lexed correctly.

Identified by @tofpie in #961 (comment)