Reduce story direct reply composer corner radius to 18dp.

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

@@ -31,7 +31,7 @@
         android:layout_marginTop="8dp"
         android:layout_marginEnd="8dp"
         android:layout_marginBottom="8dp"
-        android:background="@drawable/rounded_rectangle_surface_variant"
+        android:background="@drawable/rounded_rectangle_surface_variant_18"
         android:padding="8dp"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toStartOf="@id/reply_reaction_switch"