[vim/vim] vimscript syntax: Custom command call with the dot in the end breaks next highlighting (Issue #20854)

habamax created an issue (vim/vim#20854)

### Steps to reproduce

Use following snippet in vim filetype:

```
def RunOdin()
    update
    if !exists("$WSL_DISTRO_NAME")
        Term! odin run .
    else
        Term! odin run . -thread-count:1
    endif
enddef
```

<img width="727" height="299" alt="Image" src="https://github.com/user-attachments/assets/342e0601-16bd-4dda-9b96-998153741a12" />


### Expected behaviour

`else` should be highlighted

@dkearns fyi

### Version of Vim

9.2.843

### Environment

debian13, bash

### Logs and stack traces

```shell

```

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