fix: Remove 'async' modifier from Save function.

Author: paulhazen

Assets/Plugins/Source/Editor/EditorWindows/EOSSettingsWindow.cs

@@ -173,7 +173,7 @@ protected override void RenderWindow()
             }
         }
 
-        private async void Save()
+        private void Save()
         {
             // Save the product config editor
             _productConfigEditor.Save();