fix(router): update route snapshot before emit new values

[DzmitryShylovich]

Closes #12912

Description:
As you can see on the screenshot http://prntscr.com/dl0c79 we emit new params before we actually update route.snapshot value this is why we see previous snapshot inside a subscription. So it's a timing issue and to fix it we just need to update route.snapshot before emitting any values.

#12912 (comment) 👍

[vicb]

Thanks !

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