Don't bundle extra transform with camera in many sprites examples (#6079)

Fixes #6077 
# Objective

- Make many_sprites and many_animated_sprites work again

## Solution

- Removed the extra transform from the camera bundle - not sure why it was necessary, since `Camera2dBundle::default()` already contains a transform with the same parameters.

---

examples/stress_tests/many_animated_sprites.rs

@@ -51,10 +51,8 @@ fn setup(
     let texture_atlas_handle = texture_atlases.add(texture_atlas);
 
     // Spawns the camera
-    commands.spawn((
-        Camera2dBundle::default(),
-        Transform::from_xyz(0.0, 0.0, 1000.0),
-    ));
+
+    commands.spawn(Camera2dBundle::default());
 
     // Builds and spawns the sprites
     for y in -half_y..half_y {

examples/stress_tests/many_sprites.rs

@@ -55,10 +55,8 @@ fn setup(mut commands: Commands, assets: Res<AssetServer>, color_tint: Res<Color
     let sprite_handle = assets.load("branding/icon.png");
 
     // Spawns the camera
-    commands.spawn((
-        Camera2dBundle::default(),
-        Transform::from_xyz(0.0, 0.0, 1000.0),
-    ));
+
+    commands.spawn(Camera2dBundle::default());
 
     // Builds and spawns the sprites
     let mut sprites = vec![];