Fix shape modification not updating graphics in testbed (#708)

* Fix shape modification not updating graphics in testbed

* Add update collider to Testbed

* chore: lint shape_modifications3

* chore: simplify GraphicsManager::remove_collider_nodes

---------

Co-authored-by: Sébastien Crozet <sebcrozet@dimforge.com>

src_testbed/graphics.rs

@@ -83,13 +83,16 @@ impl GraphicsManager {
     ) {
         let body = body.unwrap_or(RigidBodyHandle::invalid());
         if let Some(sns) = self.b2sn.get_mut(&body) {
-            for sn in sns.iter_mut() {
+            sns.retain(|sn| {
                 if let Some(sn_c) = sn.collider {
                     if sn_c == collider {
                         commands.entity(sn.entity).despawn();
+                        return false;
                     }
                 }
-            }
+
+                true
+            });
         }
     }