Hide the menu icon when dialpad chooser is shown

Now that we may have the menu icon on the right side of digits
EditText, we should hide the whole container instead of the
EditText itself.

TESTED (with phone devices with/without a hard menu key):
- show dialpad chooser and see the screen is not corrupted

Bug: 5183700
Change-Id: Ib598d799799a2e65b3b61524adfa2a64e47eb456
diff --git a/res/layout/dialpad_fragment.xml b/res/layout/dialpad_fragment.xml
index 9c5099f..75d5938 100644
--- a/res/layout/dialpad_fragment.xml
+++ b/res/layout/dialpad_fragment.xml
@@ -25,6 +25,7 @@
     <!-- Text field and possibly soft menu button above the keypad where
          the digits are displayed. -->
     <RelativeLayout
+        android:id="@+id/digits_container"
         android:layout_width="match_parent"
         android:layout_height="0px"
         android:layout_weight="0.200"