Fix panel spec to avoid interference with other tests

Change-Id: Icc7f2a100d3f49ecc1a4d73161fce081070885cd
diff --git a/dev/js/spec/panelSpec.js b/dev/js/spec/panelSpec.js
index b9047eb..ccdd4eb 100644
--- a/dev/js/spec/panelSpec.js
+++ b/dev/js/spec/panelSpec.js
@@ -245,6 +245,12 @@
       expect(list.classList.contains('visible')).toBeFalsy();
 
       expect(pagination.addRandomPage()).toBeFalsy();
+
+      // Clean up
+      document.body.removeChild(p);
+      if (pagination && pagination.actions && pagination.actions().element) {
+        document.body.removeChild(pagination.actions().element());
+      }
     });
 
   });