Fixed the focus cutoff of the editor buttons in the widgets editor (#…

…65395)

* Fix the focus cutoff of the editor buttons

* Add height to fix focus cutoff

* Use header height variable

Co-authored-by: Aki Hamano <54422211+t-hamano@users.noreply.github.com>

---------

Co-authored-by: dhruvang21 <dhruvang21@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>

packages/edit-widgets/src/components/header/style.scss

@@ -82,6 +82,7 @@
 	padding-right: $grid-unit-10;
 	padding-left: $grid-unit-20;
 	overflow: hidden;
+	height: $header-height;
 }
 
 .edit-widgets-header__title {