Fix issue #2171460: Turn off background blurring of power dialog

The calendar alert dialog was also using background dimming, but
this is a complete waste since it is full screen.

Change-Id: I59efb00b23f184251e706212bc94f75a04438d6e
diff --git a/src/com/android/calendar/AlertActivity.java b/src/com/android/calendar/AlertActivity.java
index dcf9186..2a041bf 100644
--- a/src/com/android/calendar/AlertActivity.java
+++ b/src/com/android/calendar/AlertActivity.java
@@ -219,7 +219,6 @@
         a.recycle();
 
         getWindow().setAttributes(lp);
-        getWindow().addFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
 
         mResolver = getContentResolver();
         mQueryHandler = new QueryHandler(mResolver);