fix unconditional note resolution during DiskReader::realtime_locate()

When looping, we do not want to resolve notes at the end of the loop via ::realtime_locate() -
::get_midi_playback() has already taken care of this. But when not looping, we need this. So,
add an argument to tell all interested parties whether the locate is for a loop end or not

libs/ardour/plugin_insert.cc

@@ -3234,10 +3234,10 @@ PluginInsert::realtime_handle_transport_stopped ()
 }
 
 void
-PluginInsert::realtime_locate ()
+PluginInsert::realtime_locate (bool for_loop_end)
 {
 	for (Plugins::iterator i = _plugins.begin(); i != _plugins.end(); ++i) {
-		(*i)->realtime_locate ();
+		(*i)->realtime_locate (for_loop_end);
 	}
 }