fix: render errorElement when route loader is rejected

[badsyntax]

Fixes #255

• We set the RouteMatch status after loading the elements and (optional) loader
• The loader can also set the status
• Thus, we only set the resolved status for RouteMatch'es without loaders, to prevent overriding the status set by the loader

I guess you could rework this logic many ways but i thought this was the easiest to follow.

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[tom-ricci]

Hoping this gets merged eventually.