Remove unused using

Author: taooceros

Flow.Launcher/ViewModel/MainViewModel.cs

@@ -1,7 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.ComponentModel;
-using System.Diagnostics;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
@@ -19,9 +17,6 @@
 using Flow.Launcher.Plugin;
 using Flow.Launcher.Plugin.SharedCommands;
 using Flow.Launcher.Storage;
-using System.Windows.Media;
-using Flow.Launcher.Infrastructure.Image;
-using System.Collections.Concurrent;
 using Flow.Launcher.Infrastructure.Logger;
 using System.Threading.Tasks.Dataflow;