Fix genesis supply handling (backport #8930)

[mergify]

This is an automatic backport of pull request #8930 done by Mergify.
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Changes to be committed:
	modified:   proto/cosmos/bank/v1beta1/genesis.proto
	modified:   x/bank/keeper/genesis_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   x/bank/keeper/genesis.go
	both modified:   x/bank/types/genesis.go

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[alessio]

Simulations are failing

[amaury1093]

hmm ok, I can have a look into that.

[atheeshp]

I think these changes are dependent on #8473. May not be possible to backport this since #8473 changes are not here (that's why the sims are breaking).
cc: @AmauryM , @aaronc

[alexanderbez]

Why are we committing a bunch of commented-out code?

[amaury1093]

I think these changes are dependent on #8473. May not be possible to backport this since #8473 are not here (that's why the sims are breaking).

Sounds good. No need to put more effort into backporting this then, the supply genesis check will only be in v0.43.