Removing another unused field

Author: StanleyGoldman

src/UnityExtension/Assets/Editor/GitHub.Unity/UI/Window.cs

@@ -22,7 +22,6 @@ class Window : BaseWindow
         private const string Window_RepoUrlTooltip = "Url of the {0} remote";
         private const string Window_RepoNoUrlTooltip = "Add a remote in the Settings tab";
         private const string Window_RepoBranchTooltip = "Active branch";
-        private const float SpinnerAnimationDuration = 4f;
 
         [NonSerialized] private double notificationClearTime = -1;
         [NonSerialized] private double timeSinceLastRotation = -1f;