use Stud.IP 5 API for MathJax in Courseware, re #118

js/test-block.js

@@ -227,15 +227,7 @@ const CoursewareTestBlock = {
                 });
         },
         loadMathjax() {
-            let mathjaxP;
-
-            if (MathJax && MathJax.Hub) {
-                mathjaxP = Promise.resolve(MathJax);
-            } else if (STUDIP.loadChunk) {
-                mathjaxP = STUDIP.loadChunk('mathjax');
-            }
-
-            mathjaxP && mathjaxP.then(({ Hub }) => {
+            STUDIP.loadChunk('mathjax').then(({ Hub }) => {
                 Hub.Queue(['Typeset', Hub, this.$refs.content]);
             });
         },