core(screenshot-thumbnails): increase size to 120px (#4383)

lighthouse-core/audits/screenshot-thumbnails.js

@@ -11,7 +11,7 @@ const TTCI = require('./consistently-interactive');
 const jpeg = require('jpeg-js');
 
 const NUMBER_OF_THUMBNAILS = 10;
-const THUMBNAIL_WIDTH = 60;
+const THUMBNAIL_WIDTH = 120;
 
 class ScreenshotThumbnails extends Audit {
   /**

lighthouse-core/report/v2/report-styles.css

@@ -611,6 +611,7 @@ span.lh-node:hover {
 .lh-filmstrip__thumbnail {
   border: 1px solid var(--report-secondary-border-color);
   max-height: 100px;
+  max-width: 60px;
 }
 
 /* Sparkline */