delimitMate_expand_cr breaks with comments = n:)

[niklaas]

(|) hitting <cr> leads to something like

(
)|
)

which adds a superfluous extra closing bracket. Took me some while to figure out that it has something to do with

set comments = n:)

Removing n:) from comments solved the issue for me.

I don't know whether this really is a bug, so feel free to close the issue. But probably it's good to maintain it for reference.