[Enhancement] if block ends with a return statement, so drop this else and outdent its block

### Search before asking

- [X] I had searched in the [issues](https://github.com/apache/eventmesh/issues?q=is%3Aissue) and found no similar issues.

### Enhancement Request

This issue is a subproject issue of eventmesh. the subproject address is:

https://github.com/apache/eventmesh-workflow

located at:
eventmesh-wrokflow/third_party/lexer/rune_stack.go line 44

### Describe the solution you'd like


### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

Open eventmesh-workflow/third_party/lexer/rune_stack.go at line 44 and inspect the surrounding if/else and return statement. Apply the control-flow cleanup shown in the issue screenshots, then verify the subproject still passes its existing checks for the lexer.

Written by the indexing model from the issue text.