Adjust chapters filter icon to line up with download icons

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

@@ -26,8 +26,8 @@
 
     <ImageButton
         android:id="@+id/btn_chapters_filter"
-        android:layout_width="32dp"
-        android:layout_height="32dp"
+        android:layout_width="28dp"
+        android:layout_height="28dp"
         android:background="?selectableItemBackgroundBorderless"
         android:contentDescription="@string/action_filter"
         app:layout_constraintBottom_toBottomOf="parent"