Fix orbital / surface scan missions being unable to be completed #5724
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As an unintended consequence of #5671, two modules were inadvertently overwriting their previously-registered event handlers by dint of not conforming to the existing usage pattern of one handler per event per file. This pattern was made a requirement to support hot-reloading of registered event handlers, but I didn't realize we had some existing code which broke that pattern before I merged the PR.
This PR fixes an issue reported at least once on Discord where scan missions were unable to be completed after loading a saved game with an in-progress scan. I don't believe it's yet been reported over here.