Bug 1235294 - Always enable text encoding menu. r=mkmelin

mail/base/content/mailWindowOverlay.js

@@ -265,13 +265,6 @@ function view_init()
     viewAttachmentInlineMenu.setAttribute("checked", viewAttachmentInline);
 
   document.commandDispatcher.updateCommands('create-menu-view');
-
-  // Disable the charset item if there's nothing to enable
-  document.getElementById("charsetMenu")
-          .setAttribute("disabled", !msgWindow.mailCharacterSet);
-  let appmenuCharset = document.getElementById("appmenu_charsetMenu");
-  if (appmenuCharset)
-    appmenuCharset.setAttribute("disabled", !msgWindow.mailCharacterSet);
 }
 
 function InitViewLayoutStyleMenu(event)