cgen: fix array sort with fn call parameter (fix #19220)

[yuyi98]

This PR fix array sort with fn call parameter (fix #19220).

• Fix array sort with fn call parameter.
• Add test.

struct Info {
mut:
	fields []string
}

fn main() {
	mut info := Info{
		fields: ['aaa(', 'b(']
	}
	info.fields.sort(a.before('(').len < b.before('(').len)
	println(info.fields)
	assert info.fields == ['b(', 'aaa(']
}

PS D:\Test\v\tt1> v run .
['b(', 'aaa(']