fix: glob result compare (by @beaunus)

Author: francoismassart

lib/util/cssFiles.js

@@ -18,7 +18,7 @@ let classnamesFromFiles = [];
 const generateClassnamesListSync = (patterns) => {
   const now = new Date().getTime();
   const files = fg.sync(patterns);
-  const newGlobs = previousGlobsResults.flat().join(',') != files.flat().join('');
+  const newGlobs = previousGlobsResults.flat().join(',') != files.flat().join(',');
   const expired = now - lastUpdate > REFRESH_RATE;
   if (newGlobs || expired) {
     previousGlobsResults = files;