Meteors infinigib/infinisplosion fixes

Since it's probably plaguing Spookoween and my meteor PR is getting conflicts with Pumpkins Meteors, here's the hotfix for the meteors bumping bug.

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Fixed meteors not properly qdel'ing (fixing infinigibs or infinisplotions) and variables initialization (fixes #5226).
Admin-spawned meteors should not instaqdel anymore.