fix: remove scrollHandler on unbind

[demike]

Defect Fixes

Fixes a bug when using one menu for multiple targets in popup mode:
p-menu in popup mode does not close on scroll in some cases.

Szenario:
I have 40 icons. Clicking on any of them opens a menu in popup mode (only one instance of menu).
If I scroll now the menu closes ( fine! )

Then I delete the selected icon (entry in the menu).
And then I open the menu on an other icon ( show target changes).
When I scroll now the menu does not disappear.

The reason is that the scrollHandler still has the reference to the already deleted element.
This is bad for two reasons:

• It holds a reference to a deleted element (the first target)
• Scrolling will never work again because bindScrollListener wants to bind to the scroll parents of the deleted element (which are not there)

The solution is to remove the scrollHandler member of Menu on unbindScrollListener
--> no more potential leaking of deleted elements
--> works now with differenet targets passed to show();

[vercel]

Deployment failed with the following error:

Creating the Deployment Timed Out.

[mertsincan]

Could you please create an issue?