Customizer: Add `height: auto;` for `select[multiple]`.

fixes #27662.
Built from https://develop.svn.wordpress.org/trunk@27954


git-svn-id: http://core.svn.wordpress.org/trunk@27784 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/customize-controls-rtl.css

@@ -170,6 +170,10 @@ body {
 	line-height: 28px;
 }
 
+.customize-control select[multiple] {
+	height: auto;
+}
+
 .customize-control-title {
 	display: block;
 	font-size: 14px;

wp-admin/css/customize-controls.css

@@ -170,6 +170,10 @@ body {
 	line-height: 28px;
 }
 
+.customize-control select[multiple] {
+	height: auto;
+}
+
 .customize-control-title {
 	display: block;
 	font-size: 14px;