use same logic to print Chars and Atoms (#1804)

src/machine/machine_state.rs

@@ -765,6 +765,7 @@ impl MachineState {
 
                 let mut printer = HCPrinter::new(
                     &mut self.heap,
+                    &mut self.atom_tbl,
                     op_dir,
                     PrinterOutputter::new(),
                     term_to_be_printed,

src/machine/mock_wam.rs

@@ -61,6 +61,7 @@ impl MockWAM {
 
         let mut printer = HCPrinter::new(
             &mut self.machine_st.heap,
+            &mut self.machine_st.atom_tbl,
             &self.op_dir,
             PrinterOutputter::new(),
             heap_loc_as_cell!(term_write_result.heap_loc),