feat: set InputType.SCALE1 to ROTATE by default for DelegateInputHandler.fixedOrbit

thermion_dart/lib/src/input/src/delegate_input_handler.dart

@@ -73,6 +73,7 @@ class DelegateInputHandler implements InputHandler {
               minimumDistance: minimumDistance),
           actions: {
             InputType.MMB_HOLD_AND_MOVE: InputAction.ROTATE,
+            InputType.SCALE1: InputAction.ROTATE,
             InputType.SCROLLWHEEL: InputAction.ZOOM
           });