bug#63869: [shepherd] `guix system reconfigure` forgets `herd disable mysrv`

[Attila Lendvai]

i turn off some services using `herd disable`. then i do a `guix system 
reconfigure`, and these services get enabled and started.

i would expect the enabled/disabled state to be preserved across reconfigures.

if it's not easily feasible in the current architecture, then feel free to 
close this. it's not a crucial feature.

-- 
• attila lendvai
• PGP: 963F 5D5F 45C7 DFCD 0A39
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