[Glitch] Code style improvements in JavaScript

Port fd76955f39 to glitch-soc

* JS-linter: fix trailing comma's

* Configure eslinter to ignore this onchange error.

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/components/intersection_observer_article.js

@@ -45,7 +45,7 @@ export default class IntersectionObserverArticle extends React.Component {
     intersectionObserverWrapper.observe(
       id,
       this.node,
-      this.handleIntersection
+      this.handleIntersection,
     );
 
     this.componentMounted = true;