Visual update: Update the autocomplete item button background (#6048)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/1207418217763355/task/1210198169211629?focus=true

### Description

This PR updates the tap background of the autocomplete item button to
match the design.

### UI changes


https://github.com/user-attachments/assets/302326a6-1499-4499-be21-1723be1d4f18

Author: 0nko

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

@@ -59,6 +59,7 @@
         android:contentDescription="@string/editQueryBeforeSubmitting"
         android:padding="@dimen/keyline_2"
         android:src="@drawable/ic_arrow_circle_up_left_16"
+        android:background="@drawable/selectable_item_experimental_background"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toTopOf="parent"

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

@@ -56,7 +56,7 @@
         android:id="@+id/editQueryImage"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:background="?selectableItemBackgroundBorderless"
+        android:background="@drawable/selectable_item_experimental_background"
         android:contentDescription="@string/editQueryBeforeSubmitting"
         android:padding="@dimen/keyline_2"
         android:src="@drawable/ic_arrow_circle_up_left_16"