Remove unused variable

Co-authored-by: Jeremy Wu <[email protected]>

Author: Garulf

Flow.Launcher.Plugin/Result.cs

@@ -13,8 +13,6 @@ public class Result
 
         private string _icoPath;
 
-        private string _insertText;
-
         /// <summary>
         /// Provides the title of the result. This is always required.
         /// </summary>