fix: export genesis to stdout, not stderr (#11844)

## Description
present app export genesis will export to stderr,  not stdout, because [cobra `println` default is to stderr](https://pkg.go.dev/github.com/spf13/cobra#Command.Println)

`gaiad export > genesis_export.json` will not work
`gaiad export 2> genesis_export.json` will work

the fix makes gaiad export to print to stdout.



Closes: #XXXX



---

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- [ ] 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 
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server/export.go

@@ -102,6 +102,7 @@ func ExportCmd(appExporter types.AppExporter, defaultNodeHome string) *cobra.Com
 				return err
 			}
 
+			cmd.SetOut(cmd.OutOrStdout())
 			cmd.Println(string(sdk.MustSortJSON(encoded)))
 			return nil
 		},