[Minor code cleanup] Remove duplicated condition check
https://bugs.webkit.org/show_bug.cgi?id=115082

Reviewed by Andreas Kling.

areRectsPartiallyAligned() has duplicated condition check, so remove it.

* page/SpatialNavigation.cpp:
(WebCore::areRectsPartiallyAligned):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149028 268f45cc-cd09-0410-ab3c-d52691b4dbfc