Revert "Graph: Improve point rendering performance (#22610)" (#22716)

This reverts commit 0f6769665a.

public/vendor/flot/jquery.flot.js

@@ -2621,8 +2621,8 @@ Licensed under the MIT license.
                         ctx.fillStyle = fillStyle;
                         ctx.fill();
                     }
+                    ctx.stroke();
                 }
-                ctx.stroke();
             }
 
             ctx.save();