Remove unnecessary method implementation

Should be handled somewhere else

Author: jjw24

Wox.Core/Configuration/IPortable.cs

@@ -1,4 +1,4 @@
-
+
 namespace Wox.Core.Configuration
 {
     public interface IPortable
@@ -9,7 +9,6 @@ public interface IPortable
         void RemoveUninstallerEntry();
         void CreateShortcuts();
         void CreateUninstallerEntry();
-        bool IsPortableModeEnabled();
         void MoveUserDataFolder(string fromLocation, string toLocation);
         void VerifyUserDataAfterMove(string fromLocation, string toLocation);
         bool CanUpdatePortability();

Wox.Core/Configuration/Portable.cs

@@ -79,11 +79,6 @@ public void EnablePortableMode()
             }
         }
 
-        public bool IsPortableModeEnabled()
-        {
-            throw new NotImplementedException();
-        }
-
         public void RemoveShortcuts()
         {
             var exeName = Constant.Wox + ".exe";