Remove check in renderDidSuspendDelayIfPossible (#25630)

I don't think we need this anymore. It was added originally because
RootSuspended would take priority over RootSuspendedWithDelay. But we've
since changed it: any "bad" fallback state is permitted to block a
"good" fallback state.

The other status flags that this check used to account for are
RootDidNotComplete and RootFatalErrored:

- RootFatalErrored is like an invariant violation, it means something
went really wrong already and we can't recover from it
- RootCompleted and RootDidNotComplete are only set at the very end of
the work loop, there's no way for renderDidSuspendDelayIfPossible to
sneak in after that (at least none that I can think of — it's only
called from the render phase)

So I think we can just delete this.

It's entirely possible there's some scenario I haven't considered,
though, which is why I'm submitting this change as its own PR. To
preserve the ability to bisect to it later.