Bug 1473859: Change expectation for reftest unit-vh-vw-overflow-auto.html. rs=emilio

The "-auto" and "-scroll" variants of this test used to be expected to mismatch
("!="), but our behavior changed with stylo such that they started matching, so
it was marked as "fails !=".  But now we've decided that the post-stylo
matching behvavior is actually correct, so this patch is changing the manifest
line to "==" so that the expectation is that they match.

layout/reftests/css-valuesandunits/reftest.list

@@ -14,6 +14,6 @@ fuzzy(0-1,0-4) == unit-vh-vw-overflow-auto.html unit-vh-vw-overflow-auto-ref.htm
 fails-if(!Android) == unit-vh-vw-overflow-scroll.html unit-vh-vw-overflow-scroll-ref.html
 fails-if(!Android) == unit-vh-vw-overflow-scroll-x.html unit-vh-vw-overflow-scroll-x-ref.html
 fails-if(!Android) == unit-vh-vw-overflow-scroll-y.html unit-vh-vw-overflow-scroll-y-ref.html
-skip-if(Android) fuzzy-if(gtkWidget,0-1,0-2) fails != unit-vh-vw-overflow-auto.html unit-vh-vw-overflow-scroll.html
+skip-if(Android) fuzzy-if(gtkWidget,0-1,0-2) == unit-vh-vw-overflow-auto.html unit-vh-vw-overflow-scroll.html
 
 == ch-width-1.html ch-width-1-ref.html