revert background image for notifications

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

src/main/res/layout/activity_list_item.xml

@@ -36,7 +36,7 @@
         android:layout_marginTop="@dimen/standard_margin"
         android:alpha="0.5"
         android:padding="2dp"
-        android:background="@drawable/round_bgnd"
+        android:background="@drawable/round_bgnd_icons"
         android:contentDescription="@string/activity_icon"
         android:src="@drawable/ic_activity" />