Bute: Update navigation so they are vertically centre to avoid wpcom banners overlapping (#7203)

* Bute: Update navigation so they are vertically centre to avoid wpcom banners overlapping

* Bute: Change back the navigation right aligned

* Update bute/theme.json

Remove an extra curly bracket.

Co-authored-by: Sarah Norris <1645628+mikachan@users.noreply.github.com>

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Co-authored-by: Sarah Norris <1645628+mikachan@users.noreply.github.com>

bute/theme.json

@@ -724,6 +724,7 @@
 				}
 			},
 			"core/navigation": {
+				"css": " .wp-block-navigation__responsive-container.is-menu-open{justify-content:center;}",
 				"elements": {
 					"link": {
 						"typography": {