WallpaperManagerTest: Increase accepted variation for secondary color

There is some randomness to the colors selected by the k-mean
algorithm for this test. See VariationalKMeansQuantizer.java
for details.

This patch increases the accepted variation when checking secondary
color.

Test: atest CtsAppTestCases:android.app.cts.WallpaperManagerTest
Bug: 167398846
Change-Id: Ie513bdc5338d3d974de52f75c0982e6d5b1a31e8
1 file changed