Keep single line comments after nlb, after nlb

[avdg]

Fixes #583

[rvanvelzen]

Could you perhaps elaborate on why you feel this is the right solution?

[avdg]

Sure,

• By keeping lines with only single line comments, there is no need to search for comments after a long line of code. Also it doesn't break with comment readers if those are involved. If this isn't wanted, the whole pr can be aborted
• Do this only when beautify option is disabled: it's already formatted
• This shouldn't affect size and compression a lot since only a few more "\n" characters are inserted.
• By default, no comments are displayed anyway, so it doesn't harm compressed code with default options anyway.

[rvanvelzen]

Thanks! Merged as 099992e