fix adding results from searching in current playlist

previously, pointers to items in playlist were added to list.
this is utterly wrong as playlist can change at any time, so
if song is from playlist, duplicate it.

src/search_engine.cpp

@@ -286,7 +286,8 @@ void Search(SearchPattern s)
 		
 		if (found && any_found)
 		{
-			mSearcher->AddOption(make_pair((Buffer *)0, *it));
+			Song *ss = Config.search_in_db ? *it : new Song(**it);
+			mSearcher->AddOption(make_pair((Buffer *)0, ss));
 			list[it-list.begin()] = 0;
 		}
 		found = 1;