[octomap_server] Update inner occupancy periodically

[wkentaro]

No description provided.

[ahornung]

Thanks for the PR! There is usually no need to call updateInnerOccupancy() because the regular point cloud insertion updates inner nodes already.

[wkentaro]

Oh, I see.
I thought this is necessary with enabling color octomap server.
The color of point cloud centers looks not updated at the time of insertion.
Is this because color octomap server is not generated with regular point cloud insersion?