[hotkeys] fix 'R' hotkey issue

set_top() was called instead of set_selection()

Mentioned in tstack#1193

src/hotkeys.cc

@@ -953,7 +953,7 @@ handle_paging_key(int ch)
  done = true;
  }
  } while (!done);
- tc->set_top(vl);
+ tc->set_selection(vl);
  lnav_data.ld_rl_view->set_value(" " + rt.to_string());
  }
  }