Fix multiple warnings.

src/dynamics/mass_properties_capsule.rs

@@ -1,7 +1,7 @@
 use crate::dynamics::MassProperties;
-use crate::math::Point;
 #[cfg(feature = "dim3")]
-use crate::{geometry::Capsule, math::Rotation};
+use crate::geometry::Capsule;
+use crate::math::Point;
 
 impl MassProperties {
     pub(crate) fn from_capsule(density: f32, a: Point<f32>, b: Point<f32>, radius: f32) -> Self {

src/dynamics/mass_properties_cone.rs

@@ -1,5 +1,4 @@
 use crate::dynamics::MassProperties;
-use crate::geometry::Cone;
 use crate::math::{Point, PrincipalAngularInertia, Rotation, Vector};
 
 impl MassProperties {

src/dynamics/mass_properties_cylinder.rs

@@ -1,10 +1,7 @@
 use crate::dynamics::MassProperties;
-use crate::math::{PrincipalAngularInertia, Vector};
 #[cfg(feature = "dim3")]
-use {
-    crate::geometry::Capsule,
-    crate::math::{Point, Rotation},
-};
+use crate::math::{Point, Rotation};
+use crate::math::{PrincipalAngularInertia, Vector};
 
 impl MassProperties {
     pub(crate) fn cylinder_y_volume_unit_inertia(