Replace some paddings with margings in the preferences

This ensures that each Switch is always fully visible independently
of the size of system font.

Change-Id: I1e56a9537dbbb124d86ea0da76d48b7b53172e47

res/layout/preferences_dialog.xml

@@ -3,7 +3,6 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical"
-    android:paddingBottom="16dp"
     android:paddingEnd="24dp"
     android:paddingStart="24dp"
     android:paddingTop="16dp">
@@ -12,7 +11,7 @@
         android:id="@+id/preferences_auto_updates_check"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:paddingBottom="16dp"
+        android:layout_marginBottom="16dp"
         android:text="@string/menu_auto_updates_check"
         android:textSize="16sp" />
 
@@ -20,7 +19,7 @@
         android:id="@+id/preferences_auto_delete_updates"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:paddingBottom="16dp"
+        android:layout_marginBottom="16dp"
         android:text="@string/menu_auto_delete_updates"
         android:textSize="16sp" />
 
@@ -28,6 +27,7 @@
         android:id="@+id/preferences_mobile_data_warning"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
+        android:layout_marginBottom="16dp"
         android:text="@string/menu_mobile_data_warning"
         android:textSize="16sp" />
 </LinearLayout>