Style: Replace header guards with #pragma once

servers/physics_server_3d.h

@@ -28,8 +28,7 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
 /**************************************************************************/
 
-#ifndef PHYSICS_SERVER_3D_H
-#define PHYSICS_SERVER_3D_H
+#pragma once
 
 #ifndef _3D_DISABLED
 
@@ -1056,5 +1055,3 @@ VARIANT_ENUM_CAST(PhysicsServer3D::AreaBodyStatus);
 VARIANT_ENUM_CAST(PhysicsServer3D::ProcessInfo);
 
 #endif // _3D_DISABLED
-
-#endif // PHYSICS_SERVER_3D_H