Bug 1509351 [wpt PR 14188] - Update interfaces/scroll-animations.idl, a=testonly

Automatic update from web-platform-testsUpdate interfaces/scroll-animations.idl (#14188)

Source: https://github.com/tidoust/reffy-reports/blob/ad6a3af/whatwg/idl/scroll-animations.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/458282545
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wpt-commits: a606c3b63cc92971aff8bd1a83d2140ecd2815b1
wpt-pr: 14188

testing/web-platform/tests/interfaces/scroll-animations.idl

@@ -4,7 +4,6 @@
 // Source: Scroll-linked Animations (https://wicg.github.io/scroll-animations/)
 
 enum ScrollDirection {
-  "auto",
   "block",
   "inline",
   "horizontal",
@@ -15,7 +14,7 @@ enum ScrollTimelineAutoKeyword { "auto" };
 
 dictionary ScrollTimelineOptions {
   Element scrollSource;
-  ScrollDirection orientation = "auto";
+  ScrollDirection orientation = "block";
   DOMString startScrollOffset = "auto";
   DOMString endScrollOffset = "auto";
   (double or ScrollTimelineAutoKeyword) timeRange = "auto";