Manipulation: correct wrapMap assign

Author: markelog

src/manipulation/wrapMap.js

@@ -3,7 +3,7 @@ define( [
 ], function( support ) {
 
 // We have to close these tags to support XHTML (#13200)
-var wrapMap = wrapMap = {
+var wrapMap = {
 	option: [ 1, "<select multiple='multiple'>", "</select>" ],
 	legend: [ 1, "<fieldset>", "</fieldset>" ],
 	area: [ 1, "<map>", "</map>" ],