Trigger completions even if inline completion is visible (#22077)

This is related to #22069 and #21858: before both of these PRs, we would
only ever show inline completions OR completions, never both at the same
time.

Now we show both at the same, but we still had this piece of logic here,
that prevented non-inline completions from showing up if there was
already an inline completion.

With this change, it's possible to get LSP completions without having to
dismiss inline completions before.

Release Notes:

- Inline completions (Copilot, Supermaven, ...) don't stop other
completions from showing up anymore. Both can now be visible at the same
time.

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Co-authored-by: Bennet <bennet@zed.dev>