Fix grade error

app/node_views/results.html

@@ -278,7 +278,7 @@
                     </div>
                 </div>
                 <div>
-                    <div ng-if="!phantomasResults.metrics.cssParsingErrors" class="A">F</div>
+                    <div ng-if="!phantomasResults.metrics.cssParsingErrors" class="A">A</div>
                     <div ng-if="phantomasResults.metrics.cssParsingErrors" class="F">F</div>
                     <div class="notation">CSS syntax errors</div>
                     <div ng-if="!phantomasResults.metrics.cssParsingErrors" class="criteria"></div>