Use EXPECT_LE for kmeans test

In rare cases some samples could end up being same distance from two
centroids.

Change-Id: I7bbf6b6a5d308b11ea93fb82bd9648bbfcb13d65
diff --git a/test/ratectrl_qmode_test.cc b/test/ratectrl_qmode_test.cc
index 09e7d98..87774df 100644
--- a/test/ratectrl_qmode_test.cc
+++ b/test/ratectrl_qmode_test.cc
@@ -1164,7 +1164,7 @@
       if (centroid == result.second) continue;
       const int distance_from_other_cluster_centroid =
           abs(result.first - centroid);
-      EXPECT_LT(distance_from_cluster_centroid,
+      EXPECT_LE(distance_from_cluster_centroid,
                 distance_from_other_cluster_centroid);
     }
   }