Use PBD::string_to<bool> in MidiTimeAxisView class

As the conversion was performed with PBD::to_string

diff --git a/gtk2_ardour/midi_time_axis.cc b/gtk2_ardour/midi_time_axis.cc
index fcd4255a58d7d82093ee1aa2142786ae759a05aa..524cacc35d8ba7e81ce68d47282a0c92ebbf4dba 100644 (file)
--- a/gtk2_ardour/midi_time_axis.cc
+++ b/gtk2_ardour/midi_time_axis.cc
@@ -314,7 +314,7 @@ MidiTimeAxisView::set_route (boost::shared_ptr<Route> rt)
                        *i, route_id, has_parameter, parameter);
                if (p && route_id == _route->id () && has_parameter) {
                        const std::string& visible = gui_object_state().get_string (*i, X_("visible"));
-                       create_automation_child (parameter, string_is_affirmative (visible));
+                       create_automation_child (parameter, string_to<bool> (visible));
                }
        }
 }