Selection does not apply to newly created scenes

[Angus Yeh]

Newly created scenes does not get updated automatically about existing selection. This may cause further bug when multi (click on-off) select those blocks, and cause some blocks to have strange state.

[Angus Yeh]

This happens only when mode control is on Multi when the scene is created.

[Angus Yeh]

Fixed at commit cbc4d3c , by forcing selection board _notify() with current scene.

This is not very pretty, need to revise how scene manager works, regarding the things needed to be connected/synced when a scene is created.