Added search index icon

app/src/main/res/drawable/twotone_list_24.xml

@@ -0,0 +1,11 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal"
+    android:autoMirrored="true">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M3,13h2v-2L3,11v2zM3,17h2v-2L3,15v2zM3,9h2L5,7L3,7v2zM7,13h14v-2L7,11v2zM7,17h14v-2L7,15v2zM7,7v2h14L21,7L7,7zM3,13h2v-2L3,11v2zM3,17h2v-2L3,15v2zM3,9h2L5,7L3,7v2zM7,13h14v-2L7,11v2zM7,17h14v-2L7,15v2zM7,7v2h14L21,7L7,7z"/>
+</vector>

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

@@ -212,6 +212,8 @@
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_marginTop="6dp"
+            android:drawableStart="@drawable/twotone_list_24"
+            android:drawablePadding="6dp"
             android:text="@string/title_search_hint_fts"
             android:textAppearance="@style/TextAppearance.AppCompat.Small"
             android:textStyle="italic"