Fix SaveCurrentScreenshot (ryubing/ryujinx!230)

See merge request ryubing/ryujinx!230

src/Ryujinx.HLE/UI/IHostUIHandler.cs

@@ -68,5 +68,10 @@ namespace Ryujinx.HLE.UI
         /// Displays the player select dialog and returns the selected profile.
         /// </summary>
         UserProfile ShowPlayerSelectDialog();
+        
+        /// <summary>
+        /// Takes a screenshot from the current renderer and saves it in the screenshots folder.
+        /// </summary>
+        void TakeScreenshot();
     }
 }