refactor: refactor test cases for Params

[Kynea0b]

Description

Params: TestQueryParams

Add a test case because we have not tested for Params.

// QueryParamsResponse is the response type for the Query/Params RPC method.
message QueryParamsResponse {
  // params defines the parameters of the module.
  Params params = 1 [ (gogoproto.nullable) = false ];
}

spec:
https://github.com/Finschia/wasmd/blob/main/proto/cosmwasm/wasm/v1/query.proto#L63

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly. (not needed)
• I have updated API documentation client/docs/swagger-ui/swagger.yaml (not needed)

[170210]

I think the description needs to be changed, because this pr just adds tests for other permissions.