Customize: Fix clearing of a color control's setting by using proper empty value.

Props stevehenty.
Fixes #30280.


Built from https://develop.svn.wordpress.org/trunk@33938


git-svn-id: http://core.svn.wordpress.org/trunk@33907 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/customize-controls.js

@@ -1655,7 +1655,7 @@
 					control.setting.set( picker.wpColorPicker('color') );
 				},
 				clear: function() {
-					control.setting.set( false );
+					control.setting.set( '' );
 				}
 			});
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-33937';
+$wp_version = '4.4-alpha-33938';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.