fix camera jitter

scenes/test.tscn

@@ -9,6 +9,8 @@
 [node name="Test" type="Node"]
 
 [node name="Player" parent="." instance=ExtResource("2_f4ehn")]
+process_priority = -1
+process_physics_priority = -1
 
 [node name="Geometry" type="Node" parent="."]
 
@@ -31,6 +33,8 @@ shadow_blur = 6.0
 environment = SubResource("Environment_wctar")
 
 [node name="MainCamera" type="Camera3D" parent="."]
+process_priority = 100
+process_physics_priority = 100
 transform = Transform3D(0.866025, -0.321394, 0.383022, 0, 0.766044, 0.642788, -0.5, -0.55667, 0.663414, 4.894, 6.43, 6.963)
 current = true
 fov = 20.0