omni: racket should complete at end of keywords (#4352)

Consider a file like
```
 #lang racket
(require racket/gui)
```
Type `Go(eventspace-`.

Pressing <C-x><C-o> to trigger omnicomplete should suggest
```
eventspace-handler-thread
eventspace-shutdown?
eventspace-event-evt
```

It does not (instead producing "top-level" completions, as if
`(eventspace-` wasn't even there).

Debugging, place the cursor on a space _after_. Now
`ale#completion#OmniFunc(1, '')` correctly returns `1`, but when given
`(0, 'eventspace-')` it returns either the empty list or generic
completion results as described above. I'm not entirely sure of the
mechanism, but it seems that `b:ale_completion_info.prefix` is the key,
and that this is set by `ale#completion#GetPrefix`. Calling
`ale#completion#GetPrefix('racket', line('.'), col('.'))` returned `''`!

Now, it returns `eventspace-` and the completions work correctly again.

Ref #4293, #4186, #3870

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