hs: Reload signal (HUP) doesn't remove a disabled service

Reported by a user on tor-onions@:

I can confirm that on 0.3.2, commenting the hidden service options in the torrc file and then HUP does NOT disable it for which it should!

Both v2 and v3 are affected. So somehow, we broke that feature in 032. I'm putting this in 034 milestone and mark it for possible backport.

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