message: Fix download summary overlapping progress.
  The following two lines:
  ```
  Downloading 0 crates, extracting cargo-modules ...
  Downloaded 1 crates (541.8 KB) in 1.64s
  ```
  Were being combined resulting in:
  ```
  Downloaded 1 crates (541.8 KB) in 1.64sodules ...
  ```
diff: @@ -694,6 +694,8 @@ impl<'a, 'cfg> Drop for Downloads<'a, 'cfg> {
  ByteSize(self.largest.0),
  ));
  }
  + // Clear progress before displaying final summary.
  + drop(progress);
  drop(self.set.config.shell().status("Downloaded", status));
  }
  }
  