Resolve #3319074 "Update ace editor library"

Closes #3319074

asset_injector.libraries.yml

 ace-editor:
-  remote: https://cdnjs.cloudflare.com/ajax/libs/ace/1.2.3/ace.js
-  version: 1.4.8
+  remote: https://ace.c9.io
+  version: 1.8.1
   license:
-    name: Ace Editor
-    url: https://ace.c9.io
+    name: BSD
+    url: https://raw.githubusercontent.com/ajaxorg/ace/v1.8.1/LICENSE
+    gpl-compatible: true
   js:
     //cdnjs.cloudflare.com/ajax/libs/ace/1.8.1/ace.min.js:
       { type: external, minified: true }