Tune Dashboard layouts following UX spec - part 3

- remove this ugly 12dp at the bottom of the Dashboard and
use 1dp instead

See bug: #15384992 Setting Dashboard - padding updates

Change-Id: I07695b2084a389552fb8a0e89663304c0c29cf58

res/layout/dashboard.xml

@@ -20,6 +20,7 @@
     android:layout_height="match_parent"
     android:paddingStart="@dimen/dashboard_padding_start"
     android:paddingEnd="@dimen/dashboard_padding_end"
+    android:paddingBottom="@dimen/dashboard_padding_bottom"
     android:scrollbarStyle="outsideOverlay"
     android:background="@color/dashboard_background_color">
 
@@ -27,7 +28,6 @@
                 android:id="@+id/dashboard_container"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"
-                android:paddingBottom="12dp"
                 android:layout_gravity="center_horizontal"
                 android:orientation="vertical"
                 />

res/values/dimens.xml

@@ -99,6 +99,7 @@
     <!-- Dashboard padding in its container -->
     <dimen name="dashboard_padding_start">1dp</dimen>
     <dimen name="dashboard_padding_end">1dp</dimen>
+    <dimen name="dashboard_padding_bottom">1dp</dimen>
 
     <!-- Dashboard category title layout height -->
     <dimen name="dashboard_category_title_height">48dp</dimen>