Remove explicit number from string

So it can be translated properly
Test: View notification history screen
Fixes: 222128037

Change-Id: I2d11dd4e427c19ef0c003b1fa2b6882267e2026e

res/layout/notification_history.xml

@@ -186,9 +186,9 @@
                 android:layout_height="wrap_content"
                 android:orientation="vertical">
                 <TextView
+                    android:id="@+id/today_header"
                     android:layout_height="wrap_content"
                     android:layout_width="wrap_content"
-                    android:text="@string/notification_history_today"
                     android:textColor="?android:attr/textColorPrimary"
                     android:textAppearance="@style/TextAppearance.HomepageCardTitle"
                     android:paddingBottom="16dp" />