fix: sims missing app name (cosmos#12045)

## Description

This was causing the following sims failure:
```
--- FAIL: TestAppSimulationAfterImport (0.09s)
    sim_test.go:222: 
                Error Trace:    sim_test.go:222
                Error:          Not equal: 
                                expected: "SimApp"
                                actual  : ""
                                
                                Diff:
                                --- Expected
                                +++ Actual
                                @@ -1 +1 @@
                                -SimApp
                                +
```




---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/main/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

app.yaml

@@ -3,6 +3,8 @@ modules:
     config:
       "@type": cosmos.app.runtime.v1alpha1.Module
 
+      app_name: SimApp
+
       # During begin block slashing happens after distr.BeginBlocker so that
       # there is nothing left over in the validator fee pool, so as to keep the
       # CanWithdrawInvariant invariant.