Improve single_line spinner layout

chrome/android/java/res/layout/preference_spinner_single_line.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2017 The Chromium Authors. All rights reserved.
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
 <!-- Layout used by SpinnerPreference if singleLine is set to true and the device's smallest width
      is less than 360dp. This layout doesn't actually use a single line for text and spinner but is
      used as a fallback for small devices. -->
 
 <LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     style="@style/PreferenceLayout"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
+    android:paddingEnd="8dp"
     android:orientation="vertical">
 
     <TextView
         android:id="@+id/title"
         android:layout_height="wrap_content"
         android:layout_width="match_parent" />
 
     <Spinner
         android:id="@+id/spinner"
         android:layout_height="wrap_content"
         android:layout_width="match_parent"
         android:textSize="16sp"
-        android:paddingStart="0dp"
         android:paddingTop="6dp" />
 
 </LinearLayout>