5.5 beta - Archives widget is missing its closing tag

[joyously]

The Archive widget changed (I think to get a unique ID, not sure), and now the after_widget parameter is not output.

I've attached a screenshot of WP 5.4.2 on the left and WP 5.5beta on the right, and that's the only difference. You can see that the styling indicates that the widgets that follow it are inside it.

[joyously]

WP 5.4.2 is on the left and WP 5.5 beta is on the right. Note the Meta widget and Text widget are inside the Archives widget on the right.

[mukesh27]

It's regression of this #48349 changeset.

[mukesh27]

Patch.

[SergeyBiryukov]

In 48409:

Widgets: Correct the logic for displaying the after_widget parameter of the Archives widget.

Follow-up to [48349].

Props mukesh27, joyously.
Fixes #50609.