term: Use `\r` for spinner

The save/restore cursor escape sequences from `termion` do not work on
macOS.

radicle-term/src/spinner.rs

@@ -137,14 +137,11 @@ pub fn spinner_to(
 
                             write!(
                                 animation,
-                                "{}{}{spinner} {message}",
+                                "{}{spinner} {message}\r",
-                                termion::cursor::Save,
                                 termion::clear::AfterCursor,
                             )
                             .ok();
 
-                            write!(animation, "{}", termion::cursor::Restore).ok();
-
                             *cursor += 1;
                             *cursor %= DEFAULT_STYLE.len();
                         }