Notification icons increased opaqueness by 10%

Bug: 5509556
Change-Id: Ibecaecc32c9e0311e5141e8acf5a1979bb1c9260

Author: Peter Ng

packages/SystemUI/res/values/dimens.xml

@@ -57,7 +57,7 @@
     <dimen name="status_bar_icon_drawing_size">18dip</dimen>
 
     <!-- opacity at which Notification icons will be drawn in the status bar -->
-    <item type="dimen" name="status_bar_icon_drawing_alpha">40%</item>
+    <item type="dimen" name="status_bar_icon_drawing_alpha">50%</item>
 
     <!-- gap on either side of status bar notification icons -->
     <dimen name="status_bar_icon_padding">0dp</dimen>