loading indicator now uses ball-scale and is blue

 * Make mfr.js more osf-style-guide compliant[1]

 [1] https://centerforopenscience.github.io/osf-style/style.html#loader

 [SVCS-566]

Author: felliott

mfr/server/static/js/mfr.js

@@ -49,11 +49,8 @@
         // The the OSF asks for the CSS for this spinner (/static/css/mfr)
         // MFR itself does not use it anywhere
         var spinner = document.createElement('div');
-        spinner.setAttribute('class', 'ball-pulse ball-dark text-center');
-        for(i=0; i < 3; i++){
-            spinner.appendChild(document.createElement('div'));
-        }
-
+        spinner.setAttribute('class', 'ball-scale ball-dark ball-scale-blue text-center');
+        spinner.appendChild(document.createElement('div'));
         return spinner;
     }