make circular checkIcon background day/night aware

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

src/main/res/drawable-night/round_bgnd.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+       android:shape="oval">
+    <solid android:color="#222222"/>
+</shape>