parser: fix fixed array of option values (fix #19385)

[yuyi98]

This PR fix fixed array of option values (fix #19385).

• Fix fixed array of option values.
• Add test.

module main

fn main() {
	mut a := [3]?int{init: ?int(1)}
	a[0] = none
	a[1] = 2
	println(a)
	assert '${a}' == '[Option(none), Option(2), Option(1)]'
}

PS D:\Test\v\tt1> v run .       
[Option(none), Option(2), Option(1)]