don't emit units in minimal mode

src/main.rs

@@ -42,17 +42,17 @@ fn main() -> ExitCode {
             println!(
                 "{}: {}",
                 path,
-                args.unit().convert(dir_structure.size())
+                args.unit().convert_with_units(dir_structure.size())
             );
         }
     }
 
-    let total = args.unit().convert(total);
-
     if args.total() {
+        let total = args.unit().convert_with_units(total);
         println!("total: {total}");
     }
     else if args.minimal() {
+        let total = args.unit().convert(total);
         print!("{total}");
     }