Remove useless variable in Canvas.drawCircle. (#39250)

diff --git a/impeller/display_list/display_list_dispatcher.cc b/impeller/display_list/display_list_dispatcher.cc
index 937a987..0bb9330 100644
--- a/impeller/display_list/display_list_dispatcher.cc
+++ b/impeller/display_list/display_list_dispatcher.cc
@@ -1040,7 +1040,6 @@
 
 // |flutter::Dispatcher|
 void DisplayListDispatcher::drawCircle(const SkPoint& center, SkScalar radius) {
-  auto path = PathBuilder{}.AddCircle(ToPoint(center), radius).TakePath();
   canvas_.DrawCircle(ToPoint(center), radius, paint_);
 }