Add missing check for 2d physics bounce and friction setters

The override check was already present for 3d physics but missing for 2d

(cherry picked from commit 3f64215a430cb20a875a55e9dce0975449cf1400)

scene/2d/physics_body_2d.cpp

@@ -199,7 +199,7 @@ real_t StaticBody2D::get_constant_angular_velocity() const {
 #ifndef DISABLE_DEPRECATED
 void StaticBody2D::set_friction(real_t p_friction) {
 
-	if (p_friction == 1.0) { // default value, don't create an override for that
+	if (p_friction == 1.0 && physics_material_override.is_null()) { // default value, don't create an override for that
 		return;
 	}
 
@@ -229,7 +229,7 @@ real_t StaticBody2D::get_friction() const {
 
 void StaticBody2D::set_bounce(real_t p_bounce) {
 
-	if (p_bounce == 0.0) { // default value, don't create an override for that
+	if (p_bounce == 0.0 && physics_material_override.is_null()) { // default value, don't create an override for that
 		return;
 	}
 
@@ -626,7 +626,7 @@ real_t RigidBody2D::get_weight() const {
 #ifndef DISABLE_DEPRECATED
 void RigidBody2D::set_friction(real_t p_friction) {
 
-	if (p_friction == 1.0) { // default value, don't create an override for that
+	if (p_friction == 1.0 && physics_material_override.is_null()) { // default value, don't create an override for that
 		return;
 	}
 
@@ -655,7 +655,7 @@ real_t RigidBody2D::get_friction() const {
 
 void RigidBody2D::set_bounce(real_t p_bounce) {
 
-	if (p_bounce == 0.0) { // default value, don't create an override for that
+	if (p_bounce == 0.0 && physics_material_override.is_null()) { // default value, don't create an override for that
 		return;
 	}