Minor fixes or rejection route type guard and types in hook runner methods

[stackoverfloweth]

while exploring the idea of "system" or "default" hooks to handle scroll position I found a couple bugs.

• move isRejectionRoute out of createRouterReject, not used anyways
• ensure that isRejectionRouteSymbol defaults to false when updating current route. We use Object.assign to update current route. All non-rejection routes do not have this property. The initial current route is a rejection route (not found). So the property is there when we create the router and never gets unset. So every route appeared to be a rejection route
• we were taking T extends Routes on the hook runner methods but T was available from the parent function and wasn't being overridden.

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