Remove unused references

Author: jjw24

Flow.Launcher/SettingWindow.xaml.cs

@@ -1,17 +1,12 @@
 using System;
-using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
-using System.Linq;
-using System.Net;
 using System.Windows;
-using System.Windows.Controls;
 using System.Windows.Input;
 using System.Windows.Navigation;
 using Microsoft.Win32;
 using NHotkey;
 using NHotkey.Wpf;
-using Flow.Launcher.Core;
 using Flow.Launcher.Core.Plugin;
 using Flow.Launcher.Core.Resource;
 using Flow.Launcher.Infrastructure.Hotkey;