test: Fix failing test on Xbox One

This test case used a configuration that conflicted with PR #3411, in
which we began filtering out H264 over 1080p on Xbox.

Change-Id: If55fa1364639dc4c0fcadd66a3c4af2fcb22264e

test/player_unit.js

@@ -2958,7 +2958,7 @@ describe('Player', () => {
 
         manifest.addVariant(1, (variant) => {
           variant.addVideo(2, (stream) => {
-            stream.size(200, 1500);
+            stream.size(200, 1024);
           });
         });