Deprecate bulk duplicate option

This feature is now enabled by default in the Community Console, so this
commit removes the option which let users enable the feature manually.

Change-Id: I57c5e20a446ee784b72018ca71735fd40fa31471
diff --git a/src/console_inject_start.js b/src/console_inject_start.js
index 047f2b7..4b6a7ba 100644
--- a/src/console_inject_start.js
+++ b/src/console_inject_start.js
@@ -1,15 +1,11 @@
 chrome.storage.sync.get(null, function(items) {
-  if (items.loaddrafts || items.batchduplicate) {
+  if (items.loaddrafts) {
     var startup = JSON.parse(document.querySelector("html").getAttribute("data-startup"));
 
     if (items.loaddrafts) {
       startup[4][13] = true;
     }
 
-    if (items.batchduplicate) {
-      startup[4][58] = true;
-    }
-
     document.querySelector("html").setAttribute("data-startup", JSON.stringify(startup));
   }
 });