Another adjustment to handle timing issue on tests

ref #1702
-timing issue with the test still exists in #2729 since
 .description is added to the dom after the fact via js

core/test/functional/admin/settings_test.js

@@ -159,15 +159,15 @@ CasperTest.begin('Ensure image upload modals display correctly', 6, function sui
         this.click('#general .js-modal-logo');
     }, casper.failOnTimeout(test, 'waitForOpaque #general timed out'));
 
-    casper.waitForSelector('#modal-container .modal-content .js-drop-zone', assertImageUploaderModalThenClose,
+    casper.waitForSelector('#modal-container .modal-content .js-drop-zone .description', assertImageUploaderModalThenClose,
         casper.failOnTimeout(test, 'No upload logo modal container appeared'));
 
     // Test Blog Cover Upload Button
     casper.then(function () {
         this.click('#general .js-modal-cover');
     });
 
-    casper.waitForSelector('#modal-container .modal-content .js-drop-zone', assertImageUploaderModalThenClose,
+    casper.waitForSelector('#modal-container .modal-content .js-drop-zone .description', assertImageUploaderModalThenClose,
         casper.failOnTimeout(test, 'No upload cover modal container appeared'));
 });