Tweak tablet keyboard design

This change introduces,
- center align "More" key label
- remove drop shadow from key label
- darker key label color when manual temporary upper case
- narrower pop up mini keyboard
- remove unnecessary key background from pop up mini keyboard
- smaller key label in portrait

Bug: 3216592
Change-Id: I77e0733f467a88aa32e09fcbace56fe08f755229
diff --git a/java/res/layout/input_gingerbread.xml b/java/res/layout/input_gingerbread.xml
index 1991083..fe31321 100644
--- a/java/res/layout/input_gingerbread.xml
+++ b/java/res/layout/input_gingerbread.xml
@@ -28,8 +28,7 @@
         android:paddingTop="@dimen/keyboard_top_padding"
         android:paddingBottom="@dimen/keyboard_bottom_padding"
         android:background="@drawable/keyboard_dark_background"
-        android:textStyle="bold"
 
         latin:keyBackground="@drawable/btn_keyboard_key_gingerbread"
-        latin:keyTextStyle="bold"
+        latin:keyLetterStyle="bold"
         />