Improved: change uglify-js to real version number

"latest" was preventing updates in trunk demo (merge conflict)
diff --git a/themes/common-theme/webapp/common-theme/js/package.json b/themes/common-theme/webapp/common-theme/js/package.json
index d4b33b4..de29889 100644
--- a/themes/common-theme/webapp/common-theme/js/package.json
+++ b/themes/common-theme/webapp/common-theme/js/package.json
@@ -13,7 +13,7 @@
         "trumbowyg": "^2.25.1",
         "flot": "^4.2.2",
         "@chinchilla-software/jquery-ui-timepicker-addon": "^1.6.3",
-        "uglify-js": "latest"
+        "uglify-js": "3.16.3"
     },
     "scripts": {
         "uglify": "uglifyjs node_modules/flot/dist/es5/jquery.flot.js -c -m -o node_modules/flot/dist/es5/jquery.flot.min.js"