use longopt properly

Author: vladak

opengrok-indexer/src/main/java/org/opengrok/indexer/history/MercurialRepository.java

@@ -638,11 +638,10 @@ protected void buildTagList(File directory, CommandTimeoutType cmdType) {
         argv.add("-b");
         argv.add(getBranch());
         argv.add("--rev=reverse(tag())");
-        argv.add("--template");
         // Use '|' as a revision separator rather than ':' to avoid collision with the commonly used
         // separator within the revision string (which is not used in this output but better
         // safe than sorry).
-        argv.add("{latesttag % \"{rev}|{tag}\\n\"}");
+        argv.add("--template={latesttag % \"{rev}|{tag}\\n\"}");
 
         Executor executor = new Executor(argv, directory,
                 RuntimeEnvironment.getInstance().getCommandTimeout(cmdType));