Home dir not passed to simapp for state export

[alpe]

Summary of Bug

Empty string is passed to the simapp instead of the home dir.

@whylee259 reported this issue for the wasmd originally but it affects also the simd app as well.

Note: When simd was used as a template for a Stargate based chain/ migration then they would be affected as well. The fix for wasmd (https://github.com/CosmWasm/wasmd/pull/337)

Version

master (f1d877)

Steps to Reproduce

Run a local node, stop and then run simd export command

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[anilcse]

Thanks @alpe. This was used for storing the upgrade plan info which is then used for StoreUpgrades. We don't have simulations for this so never catched in tests