raise contrast of 'points possible' text to WCAG AA

common/lib/xmodule/xmodule/css/capa/display.scss

@@ -32,7 +32,7 @@ iframe[seamless]{
 div.problem-progress {
   display: inline-block;
   padding-left: 5px;
-  color: #999;
+  color: #666;
   font-weight: 100;
   font-size: em(16);
 }