Fix paths to Acorn scripts in Tern demo

Closes codemirror#5659

Author: marijnh

demo/tern.html

@@ -14,8 +14,8 @@
 <script src="../addon/hint/show-hint.js"></script>
 <script src="../addon/tern/tern.js"></script>
 <script src="//ternjs.net/node_modules/acorn/dist/acorn.js"></script>
-<script src="//ternjs.net/node_modules/acorn/dist/acorn_loose.js"></script>
-<script src="//ternjs.net/node_modules/acorn/dist/walk.js"></script>
+<script src="//ternjs.net/node_modules/acorn-loose/dist/acorn-loose.js"></script>
+<script src="//ternjs.net/node_modules/acorn-walk/dist/walk.js"></script>
 <script src="//ternjs.net/doc/demo/polyfill.js"></script>
 <script src="//ternjs.net/lib/signal.js"></script>
 <script src="//ternjs.net/lib/tern.js"></script>