remove comment on zero width types.

They should not affect the normal case. It is better they affect the capacity calculation

crates/compiler/builtins/bitcode/src/list.zig

@@ -150,9 +150,6 @@ pub const RocList = extern struct {
         element_width: usize,
     ) usize {
         var new_capacity: usize = 0;
-        // TODO: I think this shouldn't be done here.
-        // We should have a smarter way to deal with this that doesn't lead
-        // to allocating a refcount for zero width elements.
         if (element_width == 0) {
             return requested_length;
         } else if (old_capacity == 0) {