abort() to set transaction state to inactive (#258)

This was introduced by #242 as part of a refactor which changed the wording from "Unset the transaction's active flag" to "Set the transaction's state to active". Oops! This corrects the refactor.

Author: brettz9

index.bs

@@ -5266,7 +5266,7 @@ must run these steps:
     or [=transaction/finished=],
     then [=throw=] an "{{InvalidStateError}}" {{DOMException}}.
 
-1. Set the [=/transaction=]'s [=transaction/state=] to [=transaction/active=] and run the
+1. Set the [=/transaction=]'s [=transaction/state=] to [=transaction/inactive=] and run the
     steps to [=abort a transaction=] with null as |error|.
 
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