make double_quotes write option not dependent on double_quotes flag

This gives consistent results without depending on another flag.

src/heap_print.rs

@@ -487,7 +487,6 @@ pub struct HCPrinter<'a, Outputter> {
     iter: StackfulPreOrderHeapIter<'a>,
     atom_tbl: &'a mut AtomTable,
     op_dir: &'a OpDir,
-    flags: MachineFlags,
     state_stack: Vec<TokenOrRedirect>,
     toplevel_spec: Option<DirectedOp>,
     last_item_idx: usize,
@@ -555,7 +554,6 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
         atom_tbl: &'a mut AtomTable,
         stack: &'a mut Stack,
         op_dir: &'a OpDir,
-        flags: MachineFlags,
         output: Outputter,
         cell: HeapCellValue,
     ) -> Self {
@@ -564,7 +562,6 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
             iter: stackful_preorder_iter(heap, stack, cell),
             atom_tbl,
             op_dir,
-            flags,
             state_stack: vec![],
             toplevel_spec: None,
             last_item_idx: 0,
@@ -1187,7 +1184,7 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
 
         let at_cdr = self.outputter.ends_with("|");
 
-        if self.double_quotes && self.flags.double_quotes == DoubleQuotes::Chars {
+        if self.double_quotes {
             if !at_cdr && !self.ignore_ops && end_cell.is_string_terminator(&self.iter.heap) {
                 self.remove_list_children(focus.value() as usize);
                 return self.print_proper_string(focus.value() as usize, max_depth);