[balsa/wip/gtk4] ab-main: Emit "clicked" signal by name

[Peter Bloomfield <peterb src gnome org>]

commit e22d26b860d73ae6db4998a266cdf69109c8b6b5
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Tue May 21 10:30:06 2019 -0400

    ab-main: Emit "clicked" signal by name
    
    because gtk_button_clicked() has been removed.

 src/ab-main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/ab-main.c b/src/ab-main.c
index 4d5b3a451..b710ae2fb 100644
--- a/src/ab-main.c
+++ b/src/ab-main.c
@@ -934,7 +934,7 @@ ew_key_pressed(GtkEventControllerKey *key_controller,
     if (keyval != GDK_KEY_Escape)
        return FALSE;
 
-    gtk_button_clicked(GTK_BUTTON(abmw->cancel_button));
+    g_signal_emit_by_name(abmw->cancel_button, "clicked");
 
     return TRUE;
 }