chore: clippy fixes

src/dynamics/joint/spherical_joint.rs

@@ -172,15 +172,9 @@ impl From<SphericalJoint> for GenericJoint {
 
 /// Create spherical joints using the builder pattern.
 #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
-#[derive(Copy, Clone, Debug, PartialEq)]
+#[derive(Copy, Clone, Debug, Default, PartialEq)]
 pub struct SphericalJointBuilder(pub SphericalJoint);
 
-impl Default for SphericalJointBuilder {
-    fn default() -> Self {
-        Self(SphericalJoint::new())
-    }
-}
-
 impl SphericalJointBuilder {
     /// Creates a new builder for spherical joints.
     pub fn new() -> Self {