Revisions: fixes for routing and initial setting of compareTwoMode

* Fix routing handler logic (`compareTwoMode` was reversed).
* Fix routing handler typo (both should use the same handler).
* Set `compareTwoMode` to false, to start. props duck_.

See #24425.

git-svn-id: https://core.svn.wordpress.org/trunk@24646 1a063a9b-81f0-0310-95a4-ce76da25c4cd