Remove unused layout

app/src/main/res/layout/pref_item_source.xml

@@ -1,60 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="wrap_content"
-    android:background="?selectableItemBackground"
-    android:baselineAligned="false"
-    android:clipToPadding="false"
-    android:gravity="center_vertical"
-    android:minHeight="42dp"
-    android:paddingStart="?listPreferredItemPaddingStart"
-    android:paddingEnd="?listPreferredItemPaddingEnd"
-    tools:ignore="RtlHardcoded">
-
-    <LinearLayout
-        android:id="@android:id/widget_frame"
-        android:layout_width="wrap_content"
-        android:layout_height="match_parent"
-        android:clipToPadding="false"
-        android:gravity="start|center_vertical"
-        android:orientation="vertical"
-        android:paddingStart="16dp"
-        android:paddingEnd="16dp" />
-
-    <TextView
-        android:id="@android:id/title"
-        android:layout_width="0dp"
-        android:layout_height="wrap_content"
-        android:layout_weight="1"
-        android:ellipsize="marquee"
-        android:singleLine="true"
-        android:textAppearance="?textAppearanceListItem" />
-
-    <!-- Hidden view -->
-    <TextView
-        android:id="@android:id/summary"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:visibility="gone" />
-
-    <LinearLayout
-        android:id="@+id/login_frame"
-        android:layout_width="wrap_content"
-        android:layout_height="match_parent"
-        android:layout_marginEnd="-16dp"
-        android:clipToPadding="false"
-        android:gravity="end|center_vertical"
-        android:orientation="vertical"
-        android:paddingStart="16dp"
-        android:paddingEnd="16dp"
-        android:visibility="gone">
-
-        <ImageView
-            android:id="@+id/login"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content" />
-
-    </LinearLayout>
-
-</LinearLayout>