Update ACE Editor to version 1.2.9

The new ACE editor introduces full support for emojis (and, thereby, UTF-16 characters with high- and low-surrogates). Hence, we can remove our custom fix.

Further, this update will allow emojis to be used in pair programming sessions.

vendor/assets/javascripts/ace/mode-ini.js

@@ -141,12 +141,13 @@ var FoldMode = require("./folding/ini").FoldMode;
 var Mode = function() {
     this.HighlightRules = IniHighlightRules;
     this.foldingRules = new FoldMode();
+    this.$behaviour = this.$defaultBehaviour;
 };
 oop.inherits(Mode, TextMode);
 
 (function() {
     this.lineCommentStart = ";";
-    this.blockComment = {start: "/*", end: "*/"};
+    this.blockComment = null;
     this.$id = "ace/mode/ini";
 }).call(Mode.prototype);