chore: fix test warnings

src_testbed/camera2d.rs

@@ -51,7 +51,7 @@ impl OrbitCameraPlugin {
         mut query: Query<(&mut OrbitCamera, &mut Transform, &mut Camera)>,
     ) {
         let mut delta = Vec2::ZERO;
-        for event in mouse_motion_events.iter() {
+        for event in mouse_motion_events.read() {
             delta += event.delta;
         }
         for (mut camera, _, _) in query.iter_mut() {
@@ -71,7 +71,7 @@ impl OrbitCameraPlugin {
         mut query: Query<&mut OrbitCamera, With<Camera>>,
     ) {
         let mut total = 0.0;
-        for event in mouse_wheel_events.iter() {
+        for event in mouse_wheel_events.read() {
             total -= event.y
                 * match event.unit {
                     Line => 1.0,