Fix settings button state and opacity

Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>

core/css/apps.scss

@@ -610,6 +610,7 @@ kbd {
 	border-right: 1px solid $color-border;
 	width: 250px;
 	box-sizing: border-box;
+	background-color: $color-main-background;
 }
 
 .settings-button {

core/js/apps.js

@@ -78,11 +78,15 @@
 					area.slideUp(OC.menuSpeed*4, function() {
 						area.trigger(new $.Event('hide'));
 					});
+					area.removeClass('opened');
+					$(button).removeClass('opened');
 				}
 				function showArea() {
 					area.slideDown(OC.menuSpeed*4, function() {
 						area.trigger(new $.Event('show'));
 					});
+					area.addClass('opened');
+					$(button).addClass('opened');
 					var input = $(areaSelector + ' [autofocus]');
 					if (input.length === 1) {
 						input.focus();