Removed unused libhandy dependency

src/main.vala

@@ -271,7 +271,6 @@ namespace SwayNotificatonCenter {
 
     public void main (string[] args) {
         Gtk.init (ref args);
-        Hdy.init ();
 
         try {
             Gtk.CssProvider css_provider = new Gtk.CssProvider ();

src/meson.build

@@ -10,7 +10,6 @@ app_sources = [
 app_deps = [
   dependency('gio-2.0', version: '>= 2.50'),
   dependency('gtk+-3.0', version: '>= 3.22'),
-  dependency('libhandy-1', version: '>= 1.0.0'),
   meson.get_compiler('c').find_library('gtk-layer-shell'),
   meson.get_compiler('c').find_library('m', required : true),
 ]