Remove default formatting from the date on the widget

Bug: 11172770
Widget on lock screen was using the wrong default formatting for the date.
Removed formatting so that the date will not be shown until widget provider
is running.

Change-Id: Ib3000502caea4f675d4bf3804d89ce009d22a818
(cherry picked from commit d1e10c469af3424a53eb969abe07375d67c0c811)
diff --git a/res/layout/digital_widget_time.xml b/res/layout/digital_widget_time.xml
index 1cb97db..61bc92a 100644
--- a/res/layout/digital_widget_time.xml
+++ b/res/layout/digital_widget_time.xml
@@ -45,8 +45,8 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:textColor="@color/clock_white"
-            android:format12Hour="@string/abbrev_wday_month_day_no_year"
-            android:format24Hour="@string/abbrev_wday_month_day_no_year"
+            android:format12Hour=""
+            android:format24Hour=""
             style="@style/widget_label"
             android:gravity="center"
             />