[main] fix code style

addresses review of #356

Author: pkra

lib/main.js

@@ -340,8 +340,9 @@ function ConfigureMathJax() {
         delete STYLES[".mjx-test"];
         delete STYLES[".mjx-ex-boxtest"];
         //  fontURL to current MathJax version
-        if (!fontURL)
-        fontURL = 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/' + MathJax.version + '/fonts/HTML-CSS';
+        if (!fontURL){
+          fontURL = 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/' + MathJax.version + '/fonts/HTML-CSS';
+        }
         CHTML.Augment({
           webfontDir: fontURL,
           //