Drop NetworkMonitor class, because it is no longer needed

Author: byquanton

src/MainWindow.vala

@@ -201,11 +201,12 @@ public class MainWindow : Adw.ApplicationWindow {
 				return GLib.Source.REMOVE;
 			});
 
-			Services.NetworkMonitor.instance ().network_changed.connect (() => {
-				foreach (Objects.Source source in Services.Store.instance ().sources) {
+	        var network_monitor = GLib.NetworkMonitor.get_default ();
+		    network_monitor.network_changed.connect (() => {
+                foreach (Objects.Source source in Services.Store.instance ().sources) {
 					source.run_server ();
-				}
-			});
+			    }
+        		});
 		});
 
 		var granite_settings = Granite.Settings.get_default ();

src/Services/NetworkMonitor.vala

@@ -20,7 +20,6 @@ sources = files(
   'Services/DBusServer.vala',
   'Services/Backups.vala',
   'Services/MigrateFromPlanner.vala',
-  'Services/NetworkMonitor.vala',
 
   'Services/CalendarEvents/CalendarEvents.vala',
   'Services/CalendarEvents/DateIterator.vala',
@@ -115,3 +114,4 @@ executable(
   dependencies: deps,
   install: true
 )
+