db/Selection: move bool attribute to the end

May allow a better memory layout.

src/db/Selection.cxx

@@ -23,7 +23,7 @@
 
 DatabaseSelection::DatabaseSelection(const char *_uri, bool _recursive,
 				     const SongFilter *_filter) noexcept
-	:uri(_uri), recursive(_recursive), filter(_filter)
+	:uri(_uri), filter(_filter), recursive(_recursive)
 {
 	/* optimization: if the caller didn't specify a base URI, pick
 	   the one from SongFilter */

src/db/Selection.hxx

@@ -34,13 +34,13 @@ struct DatabaseSelection {
 	 */
 	std::string uri;
 
+	const SongFilter *filter;
+
 	/**
 	 * Recursively search all sub directories?
 	 */
 	bool recursive;
 
-	const SongFilter *filter;
-
 	DatabaseSelection(const char *_uri, bool _recursive,
 			  const SongFilter *_filter=nullptr) noexcept;