state: don't save genesis state in database when loaded

[erikgrinaker]

Fixes #5138. I don't have a strong opinion on this, but find it sort of odd that Load functions actually save as well.

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[codecov]

Codecov Report

Merging #5231 into master will increase coverage by 1.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5231      +/-   ##
==========================================
+ Coverage   61.45%   62.55%   +1.10%     
==========================================
  Files         198      259      +61     
  Lines       23086    27190    +4104     
==========================================
+ Hits        14187    17010    +2823     
- Misses       7652     8703    +1051     
- Partials     1247     1477     +230     

Impacted Files	Coverage Δ
node/node.go	58.51% <ø> (ø)
state/store.go	56.53% <ø> (-0.34%)	⬇️
statesync/snapshots.go	92.59% <0.00%> (-1.49%)	⬇️
consensus/reactor.go	75.37% <0.00%> (ø)
libs/rand/random.go	66.25% <0.00%> (ø)
libs/protoio/io.go	45.00% <0.00%> (ø)
libs/service/service.go	52.63% <0.00%> (ø)
evidence/reactor.go	61.20% <0.00%> (ø)
libs/log/tmfmt_logger.go	85.18% <0.00%> (ø)
crypto/merkle/proof_value.go	0.00% <0.00%> (ø)
... and 60 more

[cmwaters]

LGTM 👍

I have a little twitch when I see two functions look extremely similar but I will ignore that

[melekes]

find it sort of odd that Load functions actually save as well.

Yeah, this smells fishy 🐟