Fix cancel button

The OnClick event was pointing to old Cancel method of Patcher class. Bind it to new method CancelUpdateApp.

Author: witcher112

Assets/PatchKit Patcher/Patcher.unity

@@ -4360,7 +4360,7 @@ MonoBehaviour:
     m_PersistentCalls:
       m_Calls:
       - m_Target: {fileID: 377531153}
-        m_MethodName: Cancel
+        m_MethodName: CancelUpdateApp
         m_Mode: 1
         m_Arguments:
           m_ObjectArgument: {fileID: 0}