android: Remove unused premium header layout

src/android/app/src/main/res/layout/premium_item_setting.xml

@@ -1,42 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout 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="?android:attr/selectableItemBackground"
-    android:clickable="true"
-    android:focusable="true"
-    android:gravity="center_vertical"
-    android:minHeight="72dp"
-    android:paddingBottom="@dimen/spacing_large"
-    android:paddingTop="@dimen/spacing_large">
-
-    <TextView
-        style="@style/TextAppearance.Material3.HeadlineMedium"
-        android:id="@+id/text_setting_name"
-        android:layout_width="0dp"
-        android:layout_height="wrap_content"
-        android:layout_alignParentEnd="true"
-        android:layout_alignParentStart="true"
-        android:layout_alignParentTop="true"
-        android:layout_marginEnd="@dimen/spacing_large"
-        android:layout_marginStart="@dimen/spacing_large"
-        android:textColor="?attr/colorPrimary"
-        android:textStyle="bold"
-        tools:text="Setting Name" />
-
-    <TextView
-        android:id="@+id/text_setting_description"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_alignParentEnd="true"
-        android:layout_alignParentStart="true"
-        android:layout_alignStart="@+id/text_setting_name"
-        android:layout_below="@+id/text_setting_name"
-        android:layout_marginEnd="@dimen/spacing_large"
-        android:layout_marginStart="@dimen/spacing_large"
-        android:layout_marginTop="@dimen/spacing_small"
-        android:visibility="visible"
-        tools:text="@string/app_disclaimer" />
-
-</RelativeLayout>