Fix simulation tests

[jaybxyz]

Summary of Bug

Some simulation tests throw panic when running.

Version

latest version of develop branch

Steps to Reproduce

make test-sim-import-export
>
Running application import/export simulation. This may take several minutes...
Allocating 1 workers...
[W0] Worker is up and running
[W0] Spawned simulation with pid 54812 [seed=1 stdout=/var/folders/wn/zwc2mf1n61z7sghz9g_1wl8h0000gn/T/sim-logs-145905718/app-simulation-seed-1-date-08-24-2021_124400.stdout stderr=/var/folders/wn/zwc2mf1n61z7sghz9g_1wl8h0000gn/T/sim-logs-145905718/app-simulation-seed-1-date-08-24-2021_124400.stderr]
^[[1;6A.
.
exit status 1
[W0] Seed 1: FAILED
To reproduce run: go test ./app -run TestAppImportExport -Enabled=true -NumBlocks=50 -Genesis= -Verbose=true -Commit=true -Seed=1 -Period=5 -ExportParamsPath /var/folders/wn/zwc2mf1n61z7sghz9g_1wl8h0000gn/T/sim-logs-145905718/sim_params-1.json -ExportStatePath /var/folders/wn/zwc2mf1n61z7sghz9g_1wl8h0000gn/T/sim-logs-145905718/sim_state-1.json -v -timeout 24h
ERROR OUTPUT 

exit status 1
panic: halting simulations

goroutine 20 [running]:
main.worker(0x0, 0xc00007ca20, 0xc0000a6000)
        /Users/jayb/go/pkg/mod/github.com/cosmos/tools/cmd/[email protected]/main.go:216 +0x7a5
main.main.func2(0xc0000b2010, 0xc00007ca20, 0xc0000a6000, 0x0)
        /Users/jayb/go/pkg/mod/github.com/cosmos/tools/cmd/[email protected]/main.go:160 +0x6b
created by main.main
        /Users/jayb/go/pkg/mod/github.com/cosmos/tools/cmd/[email protected]/main.go:158 +0xc1a
make: *** [test-sim-import-export] Error 2

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