Editor: remove conflicting cm-cppmode.js

Author: pepc84

editor/index.html

@@ -131,7 +131,6 @@
 <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.16/codemirror.min.js"></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.16/mode/clike/clike.min.js"></script>
 <script src="../assets/cppmode-keywords.js"></script>
-<script src="../assets/cm-cppmode.js"></script>
 <script src="../assets/cppmode.js"></script>
 <script src="../assets/nav.js"></script>
 <script>