cursor: ensure software cursors are drawn if some outputs don't have HC

src/compositor.rs

@@ -359,6 +359,7 @@ fn start_compositor2(
         enable_primary_selection: Cell::new(true),
         xdg_surface_configure_events: Default::default(),
         workspace_display_order: Cell::new(WorkspaceDisplayOrder::Manual),
+        outputs_without_hc: Default::default(),
     });
     state.tracker.register(ClientId::from_raw(0));
     create_dummy_output(&state);