"start wox on system startup" config changes.

Wox.Infrastructure/UAC.cs

@@ -66,7 +66,6 @@ namespace Wox.Infrastructure
                 var process = new Process();
                 process.StartInfo = psi;
                 process.Start();
-                process.WaitForExit();
             }
             catch (Exception e)
             {

Wox.Infrastructure/UserSettings/UserSetting.cs

@@ -9,6 +9,8 @@ namespace Wox.Infrastructure.UserSettings
         public bool ReplaceWinR { get; set; }
         public List<WebSearch> WebSearches { get; set; }
 
+        public bool StartWoxOnSystemStartup { get; set; }
+
         public List<WebSearch> LoadDefaultWebSearches()
         {
             List<WebSearch> webSearches = new List<WebSearch>();