fix vr head and controller pos

src/app.h

@@ -118,6 +118,7 @@ public:
     bool vr_active = false;
     bool vr_only = false;
     VRController vr_controllers[2];
+    glm::mat4 vr_head;
     float vr_pressure = 1.f;
     glm::mat4 vr_rot{ 0 };
     glm::mat4 vr_uirot{ 0 };