Remove incorrect class name from tests

This was breaking the tests in IE10 and IE11

Author: simonsmith

test/index.html

@@ -812,7 +812,7 @@ <h3 class="Test-it">expand child margins to the left using remaining space along
   <h2 class="Test-it">.u-flexExpandRight</h2>
   <h3 class="Test-it">expand child margins to the right using remaining space along main axis</h3>
   <div class="Test-run">
-    <div class="u-flex u-flexJustifyEnd">
+    <div class="u-flex">
       <div class="FlexItem u-flexExpandRight">
         <div class="Content">1. item should be pushed to the left</div>
       </div>