deb: shorten the staged-tree copy progress label

The live view's bar template renders the byte counters after the
bar, so baking them into the message too duplicated them and pushed
the line past the terminal width. Announce the copy as
"Restoring <id>" and leave the counters to the view.

src/deb/mod.rs

@@ -821,16 +821,12 @@ fn copy_report<'a>(
     base_id: &str,
 ) -> Option<Box<dyn Fn(u64, u64) + Sync + 'a>> {
     view.map(|view| {
-        let label = format!("Copying the staged tree of record {base_id}");
+        // The views render the byte counters after the bar: the label
+        // must stay short or the bar line overflows a narrow terminal.
+        let label = format!("Restoring {base_id}");
         view.message(&label);
-        Box::new(move |pos: u64, total: u64| {
-            let size = crate::utils::size::format_bytes;
-            view.byte_progress(
-                &format!("{label} ({}/{})", size(pos), size(total)),
-                pos,
-                total,
-            )
-        }) as Box<dyn Fn(u64, u64) + Sync + 'a>
+        Box::new(move |pos: u64, total: u64| view.byte_progress(&label, pos, total))
+            as Box<dyn Fn(u64, u64) + Sync + 'a>
     })
 }