message: Fix failed tests
  Three was still a test which passed the whole modifiers struct instead
  of just the shift bool, this has been fixed.
diff: @@ -703,7 +703,7 @@ mod tests {
  };
  if let Event::WindowEvent { event: WindowEvent::MouseInput { state, button, modifiers, .. }, .. } = $input {
  - processor.mouse_input(state, button, modifiers);
  + processor.mouse_input(state, button, modifiers.shift);
  };
  assert!(match mouse.click_state {
  