fmt: fix formatting of fn with argument comments (fix #15354)

[yuyi98]

This PR fix formatting of fn with argument comments (fix #15354).

• Add test.

vlib\v\fmt\tests\fn_with_args_comments_keep.vv

fn main() {
	filtered_links := text_processing.filter_links(links, /* unwanted_domains = */ [
		'www.kickstarter.com',
		'www.pepper.pl',
		'tenor.com',
		'www.wykop.pl',
		'giphy.com',
	])
}