Update buttom_pressed reference image

Bug: 18540917
Change-Id: I41d775c1a95e49d231f6f9031900adff002ef4f4
diff --git a/hostsidetests/theme/assets/21/hdpi.zip b/hostsidetests/theme/assets/21/hdpi.zip
index 9cc179c..0fa67b7 100644
--- a/hostsidetests/theme/assets/21/hdpi.zip
+++ b/hostsidetests/theme/assets/21/hdpi.zip
Binary files differ