Don't leave bots behind in SE

[jmerdich]

Space Exploration has a navigation mode that creates a fake
player on other surfaces to view them from a 'satellite'. In the
existing code, any time that there isn't a character body, the robots
don't follow. Unfortunately, there also isn't a body for some cutscenes
that happen on transitions to other worlds.

Use the sanctioned interface to check if we're using the sat view vs
actually arriving somewhere else in a cutscene.

There are more sat view bugs, but not leaving the bots behind makes
them less likely to occur.

[jmerdich]

So.... this fixes one issue, but there seem to be a number of other SE-related issues with the navigation views which will likely require larger changes-- either to grab the actual character location regardless of view or otherwise disable the bots while in that state so they don't sync position on their surface with what the player is viewing on another.