Fix defect in calling code when building the ElementRoleMap

Author: samccone

src/elementRoleMap.js

@@ -24,7 +24,7 @@ for (let i = 0; i < keys.length; i++) {
       if (relation.module === 'HTML') {
         const concept = relation.concept;
         if (concept) {
-          const elementRoleRelation: ?ElementARIARoleRelationTuple = elementRoles.find(relation => dequal(relation, concept));
+          const elementRoleRelation: ?ElementARIARoleRelationTuple = elementRoles.find(relation => dequal(relation[0], concept));
           let roles: RoleSet;
 
           if (elementRoleRelation) {