Remove useless tripleClickOngoing reset on removeCharacters

Author: Kuuuube

osu.Framework/Graphics/UserInterface/TextBox.cs

@@ -868,7 +868,6 @@ private string removeCharacters(int number = 1)
 
             selectionStart = selectionEnd = removeStart;
             doubleClickWord = null;
-            tripleClickOngoing = false;
 
             endTextChange(beganChange);
             cursorAndLayout.Invalidate();