fix(query-builder): fix header position

Author: teodosiah

src/app/interactions/query-builder/query-builder-sample-1/query-builder-sample-1.component.html

@@ -2,9 +2,9 @@
     <igx-query-builder #queryBuilder
         [entities]="entities"
         [expressionTree]="expressionTree">
+        <igx-query-builder-header [title]="'Query Builder Overview'"></igx-query-builder-header>
     </igx-query-builder>
 
-    <igx-query-builder-header [title]="'Query Builder Overview'"></igx-query-builder-header>
     <div class="output-area">
         <pre>{{ printExpressionTree(queryBuilder.expressionTree) }}</pre>
     </div>