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/snippets/java.js

@@ -56,6 +56,9 @@ snippet imp\n\
 ##\n\
 ## Comments\n\
 snippet /*\n\
+	/*\n\
+	 * ${1}\n\
+	 */\n\
 ##\n\
 ## Constants\n\
 snippet co\n\
@@ -136,6 +139,9 @@ snippet findbyid\n\
 ##\n\
 ## Javadocs\n\
 snippet /**\n\
+	/**\n\
+	 * ${1}\n\
+	 */\n\
 snippet @au\n\
 	@author `system(\"grep \\`id -un\\` /etc/passwd | cut -d \\\":\\\" -f5 | cut -d \\\",\\\" -f1\")`\n\
 snippet @br\n\